The Boy Inventors' Flying Ship

by Richard Bonner

CONTENTS

CHAPTER		PAGE
[I].	Ready for the Test	5
[II].	A Signal of Distress	21
[III].	An Aerial Stowaway	31
[IV].	Into the Thick of It	42
[V].	Mutiny	54
[VI].	A Storm at Sea	66
[VII].	The Boys Find New Jobs	76
[VIII].	“This Is the Finish”	84
[IX].	Ashore	95
[X].	The Castaways	105
[XI].	Aboard the Wreck	113
[XII].	In Dire Peril	123
[XIII].	Attacked by a Whale	135
[XIV].	The Sea-Cow’s Lullaby	144
[XV].	The Professor in Trouble	153
[XVI].	The Camp in the Forest	164
[XVII].	The Giant Sloth	175
[XVIII].	In the Jungle	186
[XIX].	Indians of the Amazon	196
[XX].	An “Eel-Ectric” Discovery	205
[XXI].	The Marching Ants	217
[XXII].	“Up a Tree”	227
[XXIII].	The Cleverness of the Captain	236
[XXIV].	The Lion’s Mouth	251
[XXV].	The Tribe of Chekla	265
[XXVI].	Diamonds vs. Freedom	276
[XXVII].	The Professor Triumphs	287

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The Boy Inventors’ Flying Ship

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[CHAPTER I.]
READY FOR THE TEST.

“Shake, Tom, old boy; ‘tip us your flipper,’ as Captain Andrews would say. The Wondership is ready for her final try-out.”

“Finished.” Tom Jesson drew a long sigh, then he wrung his cousin’s hand with energy enough to have wrenched it loose.

Jack Chadwick flung down the “alligator” wrench with which he had been going over every nut and bolt, and capered about the lofty, bare-raftered shed. Tom’s round face beamed, mirroring the other’s high good humor.

“And the try-out’s going to be a big success, Jack,” he declared positively. “I can feel it in my bones,—like Jupe when his rheumatics are coming on. My! Jack, that pontoon idea was the biggest thing we’ve ever struck.”

“Wait till we’ve tried it out,” smiled Jack, less impetuously; “it may prove the biggest bump we’ve ever struck.”

“Well, I’m willing to risk it. When shall we make the trial trip?”

“No time like the present. There are a few finishing touches still to be seen to, but by this evening everything will be ready. Besides, night is the best time. We don’t want a crowd around. There has been enough curiosity in what we have been doing, already.”

“I should say so. Look at this Boston sheet, will you? A column of mystery for a cent!”

Tom drew from his pocket a copy of a Boston paper and indicated some staring head-lines.

“’A Mystery of The Night Skies!’” he declaimed vociferously, waving an arm. “Some class there, eh?”

“Quite enough,” chuckled Jack. “We didn’t think that our little spin the other night was going to cause such a stir-up, did we?”

“It was all the fault of those red and green lights you hung out,” protested Tom. “Can you blame a community for getting worked up at the spectacle of colored lights like those on a ship, skimming around above their heads at sixty miles an hour? Hullo!” he broke off, still scanning the paper. “Here’s a letter from one fellow who declares that what was seen was a comet.”

“A comet, eh? Well, that wouldn’t be such a bad name for the new Flying Road Racer,” mused Jack reflectively.

“Never heard of a comet that would swim,” retorted Tom.

“Well, we don’t know yet that the new Road Racer will perform the stunts we expect her to.”

“In which case, we are in for a cold, cold bath.”

“Cheer up, Tom,” laughed Jack. “Get busy now and finish up the pontoons with that aluminum paint. If the trial is set for this evening, we haven’t any too much time.”

Both boys fell to work again with feverish energy. The work of many weeks, carried on sometimes in high hope, sometimes in deep despondency, was before them in complete form, except for the final touches. Only the important experiment remained. Would the re-modelled Flying Road Racer do what the boys expected of her? If the answer to that question was in the affirmative, they knew that they had invented and carried to perfection the greatest craft of its kind hitherto known. The new craft would indeed merit her name of Wondership if she did what the boys confidently expected of her.

And what was this Wondership that had for weeks occupied every minute of the Boy Inventors’ time, exclusive of their studies in the Technical College that both attended in Boston? Readers of former volumes of this series will recall the Flying Road Racer, the air and land ship that had carried the boys and their friends faithfully so many miles, and in which they had encountered many stirring adventures. Well, the Wondership, as Jack in his enthusiasm had termed the craft, was nothing more nor less than the Flying Road Racer, altered almost beyond recognition.

The shed in which the changes had been carried out was located on a lonesome part of the seacoast not far from Nestorville, where the boys lived. But, remote as the spot was, it still was not far enough removed from human haunts to escape much speculation over what was going forward in the great, gaunt, unpainted shed among the sand-hills.

Inquisitive folks had watched wagons, laden with big crates and seemingly heavy boxes, making their way to the place at intervals; but so carefully had the shed been guarded and locked that nobody had as yet discovered the boys’ secret. Had anyone done so, it is certain that the two lads would have been besieged by curiosity seekers, for the craft on which they were working was the most ambitious thing that they had undertaken. The Wondership was nothing more nor less than an invention capable of travel by land, air and water. On land it rolled along on wheels, above the earth it depended on a large, gas-filled bag for buoyancy, while on the water (and this was the feature still untested), the boys hoped to make it float like a boat by means of pontoons.

Of course, the idea of pontoons as applied to aerial craft was by no means a novelty. Glen Curtiss, pioneer in this field, already had a fleet of successful hydro-aeroplanes, and many other inventors were laboring along these lines. It was in the application of the idea that the boys had radically departed from anything hitherto known. At the risk of being tedious we must now describe the Wondership at some length, in order that what is to follow of her marvelous adventures may be clear.

Readers of former books relating the experience of the Boy Inventors know that the Flying Road Racer was a craft built like an immense automobile with a semi-cylindrical body. It seated six persons, and at a pinch could accommodate more. The lower part of the cylinder was a big tank in which gas was generated from a concentrated powder which, upon being mixed with water, formed a vapor of extraordinary buoyancy. In the upper part were padded seats, storage chambers for food and supplies, and a machinery chamber housed under a hood.

Above this auto-like structure rose a framework of vanadium and aluminum alloy, on which was folded, when not in use, the gas-bag which lifted the Flying Road Racer from the earth when it was desired to fly. Pumps filled the bag with gas, or withdrew it, as was desired. Provision allowing for the expansion and contraction of the bag had also been made, as was fully described in another volume.

What the boys had done was this: They had extended the semi-cylindrical formation till they had formed a full cylinder of light but strong metal. Roughly, the Flying Road Racer now resembled a huge, gleaming white cigar on wheels. Along her sides stretched hollow aluminum planes, or wings.

In the air these took the place of the former planes used in ascending or descending. On the water it was hoped that they would act as hydroplanes, buoying up the craft. But for buoyancy they did not depend on these hydroplanes, or pontoons, alone. The body of the Flying Road Racer was, by a singular stroke of inventive ingenuity, made to be in itself a buoyant craft.

When running along the road, or while flying, the top of the cylindrical body could be opened for air and observation. On a calm sea or lake the boys believed also that the craft, with the aid of the hydroplanes, would float, just like a boat. The hydroplanes at the side would, of course, correct a tendency to roll over, which an unsupported cylindrical body would naturally have. But in case of rough water, during which they might, in the course of the long flights they meant to take, be compelled to descend, the waves would be apt to break over the craft and swamp it.

To provide against such an emergency the ingenuity of the boys had been called into full play. It took many sleepless nights and days of anxious thought to solve the problem. But they believed that they had found a solution. The open space on the top of the cylinder was provided with metal doors which could be closed and screwed down, forming a water-tight compartment. Thus, the Flying Road Racer would, in a rough sea, be a water-tight cylinder, practically unsinkable unless the light metal hull was punctured.

The next problem had been a difficult one likewise. The question of how to ventilate an air-tight and water-tight cylinder was a vexing one. It was Jack who hit upon a plan. Like most big ideas it was simple, and was suggested to him by a recollection of the periscope tube on the submarine Peacemaker, which, as told in “The Boy Inventors and the Diving Torpedo Boat,” they had helped to construct. Jack’s solution, then, was this: A collapsible twin tube was made which when extended fully would reach upward, above the air-tight cylinder, to a height of twenty-five feet. At the bottom of this tube, and inside the cylinder, was a chamber containing two tiny fans. One of these fans, driven by storage batteries, sucked in fresh air from the top of the tube; the other drew out the foul fumes and sent them up the other channel of the extension pipe.

The Wondership was driven in the air and on land and water by the same power, the gas from the storage chamber which formed the lower section of the cylinder. But to fit her for her new work extra powerful engines had been installed, and a propeller of different pattern added. The propeller-shaft was connected to the motor through a water-tight stuffing box, as on a motor boat. The rudder lines, too, led through water-tight connections to the steering wheel. The aerial rudder, being of light metal like the propeller, was capable of use both in the air and water. In place of the old driving mechanism, too, the boys had simplified the Flying Road Racer by their new form of propeller. This did away with the cumbrous connections and clutches to the rear axle. The new form of propeller drew the Wondership along the roads almost as swiftly as it pulled her through the air.

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As for the boys themselves, as readers of earlier volumes of this series know, they both lived at High Towers, the estate of Jack’s father, near Nestorville. Jack’s father was an inventor of note, and in our first story, “The Boy Inventors’ Wireless Triumph,” it was described how the boys aided him in many stirring adventures in Yucatan and in the discovery of Tom Jesson’s long missing father, an explorer and naturalist. Since that time Mr. Jesson had made his home with his brother-in-law who, like himself, was a widower. The next volume detailed how Jack and Tom helped an inventor in trouble, and how, after many perils and difficulties, a wonderful vanishing gun was at length brought to perfection in spite of the machinations of a gang of rascals. This volume was called “The Boy Inventors’ Vanishing Gun.”

The third volume has already been referred to. It told how the boys had many exciting times under the ocean and on the surface. The Peacemaker was a wonderful craft and proved of material aid to some Americans beleaguered by blood-thirsty negro revolutionists in Cuba. Through the experiences related in this book both the boys increased their mechanical ability and learned self-reliance and manliness in many a hard test of both those sterling qualities. Had this not been so, it is doubtful if they would ever have had the grit to bring to a triumphant conclusion the construction of the Wondership, beset as their way was oftentimes by apparently insurmountable difficulties. But now, as we know, the Wondership lay finished before them. Already they had tested her in flight to ascertain how she bore the added weight. It was this trial, on which she carried side lights, like a ship, that had caused the flurry in the city papers. It had been a complete success, and only the trial by water remained.

Although Mr. Chadwick and Mr. Jesson knew that the boys were engaged on a supreme task, neither had interfered or asked questions. Jack’s father believed in letting his son solve his own problems. He knew that if occasion arose his advice would be called for. But the boys meant to fight out their battle alone. Even the test to take place that evening was to be unwitnessed, or so they hoped. Not till all was an assured success did they intend to invite their parents to inspect their work.

As the term at the Technical College was over, both boys had full time to devote to their work. All day they labored with paint brush and wrench, testing and finishing. They gave themselves little time for lunch, eating with one hand and working with the other. So engrossed were they on their tasks that they did not notice that the brightness of the day outside was being dimmed rapidly. A spring storm was rolling up from seaward.

Neither did they know that their work was going forward with attention other than their own concentrated upon it. The unseen observer had alighted from a car at its terminal some miles away and tramped across the sand dunes toward the big shed. Keeping warily out of sight he made his way up to the structure and, boring a hole in the planking, watched with burning interest all that was going on within. He was an odd-looking figure, dressed in a loud checked suit and sporting a gaudy necktie and a hat cocked to one side. But his youthful face bore an inquiring, good-humored expression that belied his aggressive way of dressing. Over one shoulder was slung a camera. As he watched the boys through the small hole he had bored with a gimlet that he carried in his pocket, the unseen observer muttered strangely to himself.

“By the double-jointed hoorah of the Sahara Desert!” he exclaimed from time to time. “Dick, my boy, you’ve struck it! Instead of being fired for incompetency, you’ll be the biggest reporter in Boston to-morrow. You’ve run the Mystery of the Skies to its roost,—by the long-legged Llama of Thibet, you have!”

All day he watched, his joints stiff and aching from holding the one position, but he never budged. It was growing toward dusk before he observed the change in the weather that had come with startling suddenness. The sea, calm before, was now roaring angrily on the beach beyond the dunes. The sky was covered with scurrying clouds. The wind moaned ominously.

The unseen watcher made a grimace.

“In for a wetting and three miles to that car,” he muttered, “but by the crooked cantelope of Cambodia, it’s worth it! Hullo! What’s that?”

From seaward there had come the heavy boom of a gun. About four miles off shore, dangerously close for that coast, there lay a white, yacht-like craft. Clearly she had fired the gun. Now she ran up some sort of signal.

“By the scampering snakes of Senegambia, there’s another story!” gasped the watcher. “I’ll be made a managing editor at least, by the time I get through.”

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[CHAPTER II.]
A SIGNAL OF DISTRESS.

“Hullo! What’s that?”

Tom set down his paint pot and listened intently. Jack crawled out from under the bottom of the Wondership which he had been coating with an extra application of waterproof bronze.

“Sounded like a gun,” he said after a second.

“It did, for a fact. Jove! Hark at the wind.”

As he spoke a gust shook the rather lightly-built shed.

“Must have come on a bit rough while we were at work,” commented Jack. “I hope it isn’t too squally for our trial trip.”

Whatever Tom might have responded to this speech will never be known, for at that instant came another report.

“B-o-o-m!” The echoes came dully shoreward, borne on a flaw of squally wind.

“It is a gun,” cried Tom, “but what in the world——”

“Let’s duck out and see. Hurry up!”

Jack made off and Tom followed. They did not go out of the front end of the shed, though big doors running on rollers opened to seaward. Instead they made for a small “accommodation” door in the rear of the shed. It was alongside this that the watcher had bored his observation hole. He had just time to slip around a corner and fling himself face downward in a patch of spiky sea-grass before the boys ran out.

“Lucky those kids didn’t see me,” he muttered. “I feel half ashamed of spying on them like this. But it’s all in the game, I suppose. If I don’t run down this assignment it means hunting another job, and I’ve worked on every paper in Boston but the one I’m on now; and I haven’t got the fare to go anywhere else job hunting.”

He watched the two boys run up to the summit of a big dune which commanded a broad view to seaward.

“By the horntoads of Herrington,” he exclaimed under his breath, “now’s my chance! I’ll get a few snaps while they’re out of the shed and then dig back. It’s taking a long chance and may be a rotten sort of thing to do, but I’ve simply got to make good.”

He rose from his place of hiding and, dexterously dodging among dunes and sand hummocks, made his way to the shed and darted inside by the small door from which the boys had just emerged. If he was surprised, he counted on managing to hide in some place of security till he got a chance to escape. Dick Donovan, cub reporter on the Boston Evening Eagle, was a young man of much resource, though at present hardly an example to be emulated. Still, as he owned to himself and as his editor had informed him that morning, it was a case of “making good” or getting what the editor termed the “G. B.”—which being interpreted, meant, as poor Dick knew only too well, the “Grand Bounce.”

As is the habit in newspaper offices, such a seemingly hopeless assignment as running down “The Mystery of the Skies” had been given to the cub reporter, the reason being that he might just as well waste his time on that apparently forlorn hope as on anything more promising. But Dick, who was by no means the “bone-head” his indignant editor mentally termed him, worked on the assignment like a beaver. He recalled hearing of the Boy Inventors and their various contrivances, and he formed a conviction that if he could run them down he would arrive at a point near to the solution of the mystery of the flying lights. It had been a matter of some difficulty to find out the present whereabouts of the boys, but the indomitable Dick had finally done it. His inquiries had led him to the lonely shed amidst the wind-driven dunes, and to the beginning of what he would have called “a galloping grasshopper of a yarn.”

As the boys gained the top of the dune they saw the yacht, standing out in white relief against the slaty background of cloud that rolled up from the east. She rose and fell slowly on the sullen sea, and they could see that a vagrant cloud of bluish smoke was rolling away from her. No doubt, then, that it was she that had fired the guns.

By some instinct Jack had snatched up a pair of glasses as they ran out of the shed. They were instruments used by the boys to scan anyone approaching their shed from a distance. He now turned these on the distant yacht. The next instant he uttered an exclamation:

“There’s trouble aboard out there as sure as you’re a foot high!”

“Can you make out what it is? They’re pretty close in, and those Baking Pan Shoals run out quite a way. Maybe they’re aground,” ventured Tom.

“No; it’s not that; at least, I don’t think so. There appears to be trouble on the yacht itself. She’s flying an ensign, Jack down, in her after rigging. Wow!”

“What’s up now?”

“There’s a chap trying to pull the ensign down!” cried Jack, with the glasses still to his eyes.

“Jove!” he rushed on, “there’s another chap pulling him away from the halliards. Now there’s a regular fight on! Say, Tom, that yacht’s just sizzling right now!”

“They need help.”

“Well, it sure looks so! Hullo, some men on the stern appear to have driven back the others, among them the chap who tried to pull down the flag.”

“It’s a sure thing, then, that there is some sort of mutiny on board.”

“Looks that way,” admitted Jack; “they fired those guns for help. I wonder——”

“I have it,” broke in Tom. “There used to be a life-saving station right here because of the shoals. It’s marked on the charts. Although it was abandoned two years ago, those fellows saw our shed ashore and they think it’s the life-saving station. It’s to us they’re signalling!”

“Christmas! I’ll bet you’re right. There’s nothing else in the shape of a house up and down the beach for miles, and the summer cottagers have not arrived yet. Yes, they’re appealing to us, Tom; but I don’t see what we’re going to do about it.”

“You don’t?”

There was an odd look in Tom’s eyes as he spoke.

The next instant there was a flash and a puff of smoke from the stern of the yacht, where Jack had made out some figures standing in a little group. The others had retreated forward. The report of the signal gun was borne to their ears a few seconds later.

“If only we had a boat,” burst out Jack. “I just hate to think of those fellows out there in trouble, and we not able to raise a finger to help!”

“Oh, but we are,” spoke Tom quietly. Jack looked at him swiftly and then almost involuntarily both boys’ eyes rested on the shed behind them.

“Jove, Tom! Have you got the nerve to try it?”

“Sure thing. We planned to make the test anyhow to-day. What better opportunity?”

“It’s blowing up for bad weather, Tom,” remonstrated Jack, who was far less impetuous than his cousin.

“Well, we’ve got to expect to get caught in that sometime. Besides, I don’t think it will blow very hard.”

Like many other people, men as well as boys, Tom had a way of minimizing obstacles when he wanted to do anything very much, and the scene on the yacht had aroused his curiosity to the utmost. Jack thought a minute and then scanned the sky carefully. Dark clouds were piling up and the sea looked leaden and ugly. The wind was not steady but came in sharp gusts and flaws.

“Maybe we’ve got time to get out there and back before it comes on real bad,” he admitted.

“Of course we have. Come on.”

Tom started on a run for the shed that housed the Wondership. As he went, he flung back word to Jack to “hustle.” From the ship came a fourth booming report.

“They’re watching us through glasses,” said Jack, as they ploughed through the sand. “They’ve guessed that we are going to help them somehow.”

“That means that we’ve got to make good,” was Tom’s comment.

They had almost gained the shed door when they saw coming toward them across the dunes a solitary figure, making its way with difficulty over the heavy sand.

“It’s dad!” cried Jack. “He has come to make us a visit, and left the machine back there on the road.”

“That’s so. It is Uncle Chester, sure enough,” assented Tom rather gloomily. “I guess our trial trip is off right now.”

“Yes; I don’t think he’d allow us to take out the Wondership in such weather as this promises to be,” agreed Jack with equal ruefulness. “Still, something should be done to aid those poor people out there.”

“Hullo! What’s the matter with him?” cried Tom in an astonished voice the next instant, for, on seeing the boys, the usually dignified Professor Chadwick had broken into a run. As he floundered along he was shouting excitedly words that they could not catch, and waving something in his hand.

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[CHAPTER III.]
AN AERIAL STOWAWAY.

Mr. Chadwick, breathless from his scramble across the dunes, met the boys in the shelter of the shed. They now saw that what he held in his hand was a despatch of some sort. He soon explained that it was a wireless message, relayed from the yacht Valkyrie,—via Sciuticut,—stating that his friend Professor Bismarck Von Dinkelspeil, on board the Valkyrie, was bound for South America on a scientific search of some sort, and intended to pay him a call at High Towers regarding the practicability of devising some sort of a novel boat. Details were not given.

“I hastened over here as soon as I got the despatch,” he said, “as I knew that you boys were transforming the Road Racer into some novel form. The Professor may be here to-morrow, and if you wish me to I’ll present you to him and you may be able to meet his demands. I’m too busy at present on that new steel reducing furnace to spare any time.”

“He gives no details?” asked Jack.

“No, as you see, it’s just a hurried despatch dated from his yacht. He is a celebrated man and has been all over the world on various scientific quests, in the interests of zoölogy mainly. But you boys look excited. What’s the matter?”

Jack speedily placed his parent in possession of the situation confronting them.

“The yacht is in need of aid, you think?” he asked when Jack completed a hurried and breathless recital.

“Without doubt. Hark! There’s another gun,” cried the boy. “I wish we could go to their help.”

“If we had a boat——” began Jack’s father. But the boy cut him short. Without further delay he plunged into an explanation of the Wondership. Mr. Chadwick looked amazed for an instant, but then his face resumed its customary air of studious calm.

“You think your device will work?” he asked, regarding Jack keenly.

“I’m sure of it. In fact, we have buoyancy to spare. On paper——”

“Paper and practice are different things, my boy.”

“I know, sir, but——”

“You see, there are human lives at stake out there. It’s worth risking,” broke in Tom, unable to keep silence any longer. “Can’t we go?”

Mr. Chadwick considered an instant.

“Let me take a look at your ‘Wondership,’ as you call it,” he said.

With what rapidity Jack exhibited the craft and showed off her good points may be imagined. While they were thus engaged there came the sound of another gun. Then Mr. Chadwick spoke.

“Is everything ready?”

“Down to the last nut on the ultimate bolt,” declared Jack.

“Plenty of gas?”

“A reservoir full and more gas-making stuff in the reserve chamber.”

“Very well, then. I’m ready when you are.”

And without any more words Mr. Chadwick climbed into the machine, using in his ascent a small ladder set against the gleaming metallic sides. The boys exchanged glances. But they didn’t make any comment. It was not a time for words. While they waited even, events might be transpiring aboard the strange yacht of an unknown, possibly tragic, nature.

“Open the doors, Tom,” ordered Jack, in a voice that sounded like anybody else’s rather than his own.

Tom hastened to obey. The big panels in front of the shed rolled back. The opening thus revealed framed a wild sea-scape of rising waves, overcast sky and, in the center, the yacht, her reversed ensign making a bright splotch of color against the leaden background. But as yet the wind was merely puffy, and not blowing with dangerous strength.

Having opened the doors, Tom hastened back. He climbed in by Jack’s side.

“Are we all ready?” he asked, with a gulp. In his excitement his heart was bounding with sufficient velocity to be uncomfortably evident. But he managed, by an effort, to keep calm, or rather to appear so.

“As ready as we’ll ever be, I guess. Be ready to lower those hydroplanes when I give the word.”

Tom nodded. The hydroplanes worked on toggle-joints and could be lowered and locked when required. This was a part of his duty that the boys had already rehearsed. Jack’s hand sought a lever. A hissing sound followed. The gas was beginning to rush into the big gas-bag. Its folds began to puff out and writhe as if some living thing was within it.

“I’ll start when it is half full,” announced Jack in a sober voice.

“How’s the pressure?” inquired Tom, whose face was pale.

“Fine; a trifle over five hundred pounds. We’ll fill quickly on that.”

In the rear seat, which might be likened to the tonneau of an auto, sat Mr. Chadwick. Not a trace of emotion was visible on his strong features. Through his spectacles he eyed the boys’ preparations with interest. It was by no means his first trip in the Flying Road Racer, as he still called it, and he knew that the boys thoroughly understood her management. Therefore he did not embarrass them with questions or suggestions.

“That’s enough,” announced Jack presently, when the bag was almost full, “that will lift us and I’ll fill out the wrinkles while we are in the air.”

“You’re going up first, then?”

“Of course. That will give you a chance to get over your ‘rattles’ before we drop.”

“Rot!” vociferated Tom indignantly. “I’m not rattled a bit.”

But his shaking hands and shining eyes belied his words. If not “rattled,” Tom was considerably excited. Jack, on the other hand, although his pulses were throbbing uncomfortably fast and a large lump appeared to have clambered into his throat and stuck there, was outwardly as cool as ice.

“Ready, Dad! I’m going to start! Hold tight!”

“All right, my boy. Go ahead as soon as you’re ready.”

Jack pressed a button on the steering pillar. The self-starting mechanism, operated by the same storage batteries that ran the lights and the ventilating fans, whirred loudly in response. An instant later he applied the gas. A volley of explosions followed. The shed was filled with an odd, sickly odor.

Again Jack’s hands flew, and with a jolt the Wondership leaped forward, rumbling over the wooden floor.

Straight out toward the sand dunes she rolled, her engine pulsing like a throbbing human heart. The light but strong framework vibrated under the strain. The great propeller of magnesium-vanadium metal became a mere shadowy blur.

Outside the shed a sort of runway had been built leading down to high water mark. As the odd craft rushed toward the waves Tom was conscious of a queer feeling, centering at the pit of his stomach.

“Guess I must be scared,” he snorted indignantly to himself, and then broke off with a sudden exclamation.

“What’s that?”

“What’s what?” came from Jack, who was busy adjusting levers and buttons.

“Why, that.”

As he spoke, both boys became aware of an odd sort of muffled sound, coming seemingly from under the seat on which they were stationed.

“Something’s wrong with the machinery,” cried Tom, as the odd sound came again.

“Can’t be. She’s working like a clock,” rejoined Jack. “Hold tight,—we’re going up.”

As Jack spoke, he applied a full stream of gas to the limp bag, and the Wondership shot upward with the swiftness of a rocket. A gust of wind struck them and sang weirdly through the rigging and supports. But the craft never wavered on her course. As she shot upward, though, from the yacht, heard above the hum and buzz of the machinery, came the sound of another gun.

“They’re wishing us luck!” cried Jack.

“We’ll need all we can get,” came a voice. “By the bounding brown buffaloes of Brunswick, this is the limit!”

“Hullo! What’s the matter with you, Tom?” cried Jack looking around in astonishment, as he manipulated the craft with a skill born of long practice.

“I didn’t speak, Jack. It was that same mysterious voice. This craft is haunted, I believe.”

“Nonsense. We must be imagining things,” declared Jack; “but I’m almost sure I heard a voice.”

“So am I. How is she working, Jack?” asked Tom, dismissing the subject. He thought that his overwrought nerves were at work.

“Finely. I’m heading straight for the yacht. I mean to circle her and then,” he paused an instant and added, “drop!”

Jack now pushed the craft ahead at full speed. Faster and faster she went. Far below them lay the sullenly heaving ocean. Beyond, but very close now, was the yacht.

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“All right, Tom. Get ready now.”

Tom jumped to his work. In a few seconds the novel aluminum hydroplanes were adjusted and fixed in place. The yacht was right below them now, but the figures on her deck were dwarfed to pigmies. Jack set the suction pump to work, reducing the gas supply in the bag.

Slowly at first, and then faster, the great air craft began to fall toward the gray sea. The propeller ceased revolving. In almost total silence, except for the boys’ quick breathing, the descent continued. Suddenly a wild cry split the air. It appeared to come from the Wondership itself.

“Let me out! Put me ashore! By the buck-jumping broncos of Butte, I wasn’t born for a watery grave!”

“Gracious!” cried Jack, in a startled tone, as a head of red hair poked itself out from under the seat, “we’ve got an aerial stowaway aboard!”

---

[CHAPTER IV.]
INTO THE THICK OF IT.

For the moment, the affairs of Dick Donovan,—our readers will have guessed that this first aerial stowaway on record was the young reporter,—had to wait. This drop through space was too thrilling, daring, dangerous for anyone on board to pay Dick more than passing attention. There was not even time to ask him who he was.

Indeed, at the instant that Dick, who had hidden in the machine without any idea that immediate flight was to be undertaken, made himself known, peril loomed swiftly and ominously before them.

As they swooped downward, like a giant fishhawk diving after its finny prey, there was a sudden shout of alarm from Tom. The great airbag swung to one side, dragging the carriage of the flying machine with it in a dizzying swerve.

“Look out!” shouted Tom excitedly.

There was no need to ask him the cause of his sudden alarm. The Wondership, yawing before a sharp flaw of wind which came too suddenly for Jack to counter it, was being driven straight for one of the slender, sharp-topped masts of the yacht.

“Keep her off!” shouted Mr. Chadwick, half rising, “we’ll rip the bag open if you don’t look out.”

Jack’s lips set grimly, determinedly. With a swift motion of his hand he applied power. The propeller began to whirl, forcing the wind-driven craft away from the peril of the mast. Dick Donovan, in frank terror, shouted aloud.

“Gracious! We’ll strike!” was the cry forced from Tom’s lips.

The next instant, despite Jack’s prompt action, the Wondership, deliriously sagging and swaying, crashed against the tip of the yacht’s after mast.

Ri-i-i-i-i-i-i-i-i-p!

The steel tipped weather-vane that was fixed on the top of the spar had penetrated the midship section of the bag and inflicted a bad tear in it before Jack had had time to hold the big craft off. The propeller had been set in motion an instant too late. With a vicious hissing sound the gas rushed from the rent as the Wondership, the mischief done, careened drunkenly away from the mast that had inflicted the wound.

There was a sudden, appalling dash downward. A stone from a roof could not have fallen much faster. Amidst a shout of alarm from the yacht’s decks, which was echoed by those on the Wondership, she struck the sea with a force that sent spray and foam half way as high as the vessel’s mast heads.

In the dreadful moment that succeeded, it seemed as if the craft must go crashing down to the very floor of the ocean. But a fraction of a second later those on board both Wondership and yacht knew that this was not to be the case.

Having struck the water, the hollow hydroplanes and the water-tight body of the craft fulfilled their purposes right nobly. Buoyed on the crest of a big swell, the Wondership floated, and the next instant, amidst a cheer of more than ordinary fervor, Jack started her for the yacht’s side.

“Hurrah! She floats!” yelled Tom.

“By the galumping galleons of Gaul, she does that!” agreed Dick Donovan, against whose pale face the freckles stood out like spots on the sun.

“But will she move?” cried Mr. Chadwick, as the propeller began to churn the water.

“We’ll soon see,” answered Jack over his shoulder.

As the blades bit into the water the Wondership was drawn forward, slowly at first and then, gathering speed as she crossed the space intervening between herself and the yacht’s side, the Wondership was seen to adapt herself to the water as well as she had to the earth or the air. A moment later, skillfully manipulating his rudder, Jack brought the strange craft alongside the yacht’s lowered companionway with as much skill as any veteran mariner making a familiar landing.

To reach the gangway from the spot at which the Wondership had struck the water, they had to pass her stern. On the graceful, narrow counter of the craft was much gilt scroll-work and ornamentation. Amidst all this “flummery,” as sailors call it, they made out a name and hailing port.

“Valkyrie-of-Bremen,” was what they read.

As his eyes encountered the name, Mr. Chadwick gave a gasp.

“Why,—why! This is most extraordinary!” he cried in frank amazement. “This is the very yacht from which my wireless message was relayed from Sciuticut!”

“They must have been trying to make for the mouth of the Nestorville River when whatever is the matter on board, came up,” commented Jack.

But by this time they were at the gangway and conversation ceased for the time being. They could see several heads poked over the side, eying them curiously. As they came alongside, a stockily built man with a bristling straw-colored moustache descended the gangway stairs.

He wore a blue coat with brass buttons and appeared to be in authority.

“What’s the trouble?” demanded Jack eagerly, as the man came nearer.

“Good. You saw our signal for aid, then?” he said with an odd sort of hesitation. “You come near wrecking that contraption, just the same,” he added. “What kind of a craft is it?”

“Never mind that now,” exclaimed Mr. Chadwick impatiently. “The question is, do you need help? Are you aground, or what?”

“No, it ain’t that exactly,” said the man slowly; “it’s trouble of another sort.”

“Is this Professor Von Dinkelspeil’s yacht?” asked Jack quickly.

“Sure. Yes, it’s his yacht, all right,” was the odd reply.

“Is the Professor on board?” asked Mr. Chadwick. “He’s a friend of mine, and if he is in any difficulty we shall be glad to do anything in our power to help him out.”

Again the man hesitated. While they had been flinging questions at him he had been joined by another man, a rough looking specimen, clad in a semi-nautical costume. He now turned to this man and they whispered together for an instant. Then the bristly-moustached man turned to our party.

“The Professor is on board,” he said, “but I don’t know if you can see him.”

“Why not?” demanded Mr. Chadwick crisply, with rising irritation. “You signalled us for aid, we came out here at considerable risk and, in fact, have seriously damaged our craft. If the Professor is on board, I think he owes us an explanation.”

Once more there was a whispered conversation.

“There’s something extremely odd about all this,” said Mr. Chadwick to Jack in an undertone. “I can’t understand it at all. I——”

“The fact is,” broke in the bristly-moustached man, “the Professor has met with an accident. But perhaps you had better come on board and see him for yourselves.”

“I guess that would be the best plan,” said Mr. Chadwick. “Boys, you wait here. I’ll be back before long.”

“I don’t half like the look of this,” muttered Jack. “There’s something here that isn’t all right. Let me go with you.”

“No, my boy. You stay where you are. I’ll be back before long. I can’t imagine what can be the matter; but whatever it is, I can take good care of myself.”

With these words Mr. Chadwick sprang to the platform of the gangway, and under the guidance of the two men he made his way up the steps. An instant later he was gone from view.

The boys exchanged glances.

“Well,” blurted out Tom, “if this doesn’t beat the band! These fellows waste powder enough for a Fourth of July celebration to summon aid, and when it comes they don’t appear to know whether they want it or not.”

“Looks mighty fishy,” admitted Jack. “I wish Dad had let me go with him. But see here, Tom, we’re forgetting all about our stowaway. Say, who are you, anyhow?” he demanded, turning to Dick Donovan and scrutinizing him sharply. Dick looked considerably abashed.

“I guess it’s up to me to make explanations,” he said. “My name is Dick Donovan. I’m a reporter. I was told to run down the ‘Mystery of the Skies’ or get fired. I sneaked into your shed when you went out to take a look at this yacht, and then when you came back unexpectedly while I was snapping your machine, I got rattled and hid under the seat. Wow! By the sky-scraping sultans of Syria, but you gave me a royal old scare!”

“That is nothing to what you are going to get if you write a line about all this in your paper,” snapped Tom. “What do you mean by playing the sneak about our work-shed and spying on us,—eh? What do you mean by it?”

He doubled up his fists threateningly; but Dick Donovan only smiled.

“Don’t get mad,” he said. “I’ll admit it wasn’t the right thing to do, and you chaps appear to be pretty white and I’m ashamed of myself for spotting you.”

“You ought to be,” growled Tom.

“Wait a minute,” put in Jack soothingly. “Go on,” he remarked to Dick Donovan.

“Oh, well, all I wanted to say was this,” said the reporter, getting very red. “You needn’t be afraid that I’ll write a line about this thing, because I won’t. I can get another job somehow, I guess, and anyhow I’ve had enough experience crammed into this last half hour to be able to sit down and write a novel.”

The impulsive Tom’s manner changed in a jiffy.

“Say, you’re all right, Donovan,” he exclaimed, “and—and I tell you what, when we get this thing perfected we’ll give you the first news about it,—a scoop, don’t you call it?”

Dick’s amiable face beamed broadly as Jack nodded his assent to Tom’s promise.

“Say, that’s bully of you!” he cried boyishly, extending his hand. “I don’t want you to think I’m a bounder just because I came peeping and peering about your shack back there. I didn’t look at it from your point of view. I——”

He broke off abruptly. His lower jaw remained dropped just as it had been as he was about to continue speaking. At the same instant both the Boy Inventors sprang to their feet.

It was a startling enough interruption that had occurred to cut short Dick Donovan’s contrite speech.

From the decks of the Valkyrie there had come the sharp, ringing report of a pistol.

It was followed by shouts and a loud tramping of feet on the planks above them. Jack paused a second for thought and then, grabbing up a monkey wrench and calling to the others to do the same, he jumped for the companionway.

---

[CHAPTER V.]
MUTINY.

As the three boys, for Dick Donovan brought up the rear, sprang up the gangway steps the burly figure of a sailor suddenly blocked their way.

“You kids keep out of this,” he admonished, and tried to push Jack back.

The boy’s fist shot out and the sailor, caught fairly on the point of the chin, fell in a sprawling heap. Jumping over his prostrate form, as he lay there swearing and trying to regain his feet. Jack and his companions gained the deck.

The first thing their eyes fell upon was Mr. Chadwick struggling in the arms of several sailors. Jack reached the deck just in time to see a noose thrown over his father’s head, making him a helpless captive as it was swiftly drawn down and pulled tight about his arms.

“Let my father go!” shouted Jack angrily, springing forward.

The bristly-moustached man stood in his way. As the boy rushed forward the man thrust out his foot and Jack fell in a heap. In an instant the sailor pounced on him. But Tom, with a shout, pitched upon Jack’s captor. In a flash they were rolling all over the deck.

Jack regained his feet as the heavy form of his captor was removed. Dick Donovan was at his side.

“I’m with you, by Barataria,—I’m with you!” he cried, throwing himself into an attitude of defense as several men ran toward them. Tom had by this time managed to throw off the man whom he had attacked and, springing to his feet, he joined his comrades. The three boys, their backs to a deck house, faced the crew of the yacht without flinching; but their faces had grown deadly pale. Mr. Chadwick had been dragged off and was not to be seen.

The bristly-moustached man got to his feet and glowered at the boys menacingly. Under one of his eyes, so Jack noted with satisfaction, was a rapidly-spreading, plum-colored bruise.

“Now see here, you kids,” he barked out, “it ain’t a bit of good, your putting up a scrap. Your dad tried it and it took a bullet to stop him.”

“You rascal! You wounded my father?” shouted Jack, rushing at him, completely carried away by anger.

But he had not advanced a foot before he was seized by a dozen of the crew who, despite all his struggles, held him fast.

“You see it ain’t a bit of use, your kicking,” went on the man, vindictively. “This yacht carries a crew of twenty men and they’ll all do just as I tell ‘em to. Now that you know what you’re up against, I’ll explain a few things to you just to show you that there’s nothing you can do against my wishes.”

Despite their indignation, the boys listened eagerly for what was to come. Tom and Dick still held their attitudes of defense. Poor Jack was too effectively held to do anything but submit, with what grace he could.

“Them guns you heard was fired by the Professor’s orders. He figured there was a bunch of life savers ashore who’d come out and clap us all in irons for mutiny. We rushed him and finally he saw it was no go and gave in. He’s a prisoner in his cabin now.

“If you and your dad hadn’t come butting in in that contraption of yours we’d have gone on our voyage all peaceable; but you interfered, and now you’ve got to pay for it. If we let you go ashore you’d get the gov’ment after us and we’d get in hot water. As it is, we’ll just lock you up till we make up our minds what to do with you, and then we’ll dispense with you someway.”

“Is my father hurt?” demanded Jack.

“No, he’s all right and will be all right as long as he keeps quiet. I fired a shot at him to keep him quiet, scare him like. That’s all. You can take ‘em below, men, an’ then we’ll keep on our course.”

“But our ship!” cried Jack, anxiously. “What’s going to become of that?”

“Oh, that blamed contraption? Well, that can just as well go to the bottom as not, I guess. Take ‘em away, you fellows.”

Jack, half crazed at the last words of the rascal, was dragged helplessly off. Tom and Dick made a feeble show of resistance, but they, too, were speedily captured and hauled across the deck after him. Unarmed as they were, they had no chance of putting up any fight. And so, within an hour after they had set out to answer the call for assistance, they found themselves prisoners and their Wondership doomed to destruction. No wonder that their hearts felt like lead as their captors roughly shoved and pulled them along.

In this way they were propelled down a flight of steps leading, as soon became apparent, into the saloon of the yacht. From this chamber there opened off several smaller doors. One of these was open and through this and into a small cabin the boys were roughly thrust. Then the men who had made them captive went off without a word, first locking the door behind them on the outside.

The boys looked miserably at each other as the door clicked.

“Prisoners!” exclaimed Jack.

“And the Wondership to be cast away,” cried Tom despairingly, sinking down on the edge of a bunk. “There’s all our work and money gone for nothing,” he added bitterly.

Dick Donovan said nothing. He felt that of them all he was the only one who had no right to say anything. He was there by his own fault solely, and the freckle-faced boy felt that it would have been an impertinence on his part to have made any complaint.

“Well, this is a fine fix,” exclaimed Tom at length, after a long silence, during which they had heard a trampling of feet on deck but had noticed no vibration to show that the yacht was in motion.

“Yes; and that there is so far no explanation for our treatment doesn’t make it any better,” spoke up Jack wretchedly. “It’s the thought of the Wondership being cast loose that makes me feel worst, though.”

“Same here,” muttered Tom dismally; “but can you form any idea as to why we’re being treated in this way?”

Jack shook his head.

“It’s all a Chinese puzzle to me,” he said. “Of course, that ruffian on deck hinted that there had been a mutiny of some sort, and that between the time that we answered the signal guns and the moment we reached the ship the Professor had been made prisoner.”

“Didn’t you see a struggle to pull down the flag when you looked through the glasses?” asked Tom.

“Yes, two or three men on the stern deck appeared to be battling with some others whom they finally drove off.”

“Then depend upon it, the whole crew has not mutinied. Probably the men you saw were the Professor and the Captain or some other officer who had remained loyal,” struck in Dick Donovan. “Come to think of it, I believe I saw a despatch in the paper some time ago about this very yacht,” he went on. “The cable came from the Canary Islands and said that the Valkyrie had put in there with a mutinous crew and shipped another one. She then proceeded on her voyage across the Atlantic. There was some mystery about her destination, but it was generally supposed that she had on board a party of treasure hunters bound to recover lost treasure somewhere in South America.”

“From what I’ve heard dad say about Professor Von Dinkelspeil,” said Jack, “I don’t think the professor is much of a chap for that sort of thing. Dad said that he was a famous naturalist.”

“Maybe he was going to combine natural history and treasure hunting in South America,” suggested Dick. “Anyhow, one thing is sure; for some reason this new crew has mutinied like the old one. They now have possession of the ship and we are their prisoners. The question is, what are they going to do with us?”

Dick’s clear way of putting it made them all look serious. It was plain enough that, after treating them in the manner that they had, the mutinous crew could not afford to chance setting them ashore. In that case their ultimate fate remained a mystery.

“What do you think about it?” asked Tom, turning to Dick. In some way he felt that this bright-eyed, alert lad was more likely to have the key to the situation than any of them. But Dick shook his head perplexedly.

“What they mean to do with us depends a heap on what they intend to do themselves,” he said dubiously. “It’s my idea that, right or wrong, the rascals now in control of this craft must have had some sort of idea that she was on a treasure hunt. In that case, I think it’s likely that they may have secured in some way information as to where the treasure is, and are going after it themselves.”

“Then I wonder what they will do with us?” insisted Tom.

“By the grinning gondoliers of Granada, you’ve got me stuck. Maroon us, maybe, on some island, or——”

“Hullo! We’re moving!” cried Jack suddenly.

A perceptible vibration and hum ran through the yacht’s frame as her engines began to revolve. There was a port-hole in the cabin in which the boys were confined and Jack thrust his head out. But he could see no signs of the Wondership. Instead, through the rain which was now falling fast on a sullen, heaving sea, he could perceive, dimly, the distant coast line slipping by.

It was at this juncture that an odd sound came on the wall of the cabin.

“Somebody’s tapping!” exclaimed Tom, the first to solve the mystery.

“Sure enough,” rejoined Dick; “maybe it is your father. They may have put him in next door.”

“Hark!” exclaimed Jack suddenly. “Listen to those taps. Don’t you notice something odd about them?”

They listened in silence for a few minutes. Above the throbbing of the screw and the rush of water along the moving vessel’s side they could catch the odd rhythm of the taps being delivered on the cabin wall.

“By the ticker-tapes of Tripoli,” cried Dick suddenly, “somebody’s telegraphing us!”

“Yes; it’s the Morse code!” almost shouted Jack, and leaning against the wooden wall of the cabin he energetically rapped out a reply.

---

[CHAPTER VI.]
A STORM AT SEA.

In fifteen minutes or so the boys learned, by means of this novel method of telegraphy, that in the next cabin to them were imprisoned Mr. Chadwick, Professor Von Dinkelspeil and Captain Abe Sprowl, the skipper of the yacht. As we already know, both our lads were experts at the key, as was their father, and Dick Donovan had picked up enough of the art in newspaper offices to be able to understand at least part of what Mr. Chadwick was signaling.

It naturally took some time to place them in full possession of all the facts pertaining to their uncomfortable position, but by degrees they were told all that Mr. Chadwick knew of the case. The crew of rascals at present in possession of the yacht was the same outfit that had been shipped hurriedly at Madeira. Either out of maliciousness, or because they really believed it, certain members of the old crew had told the new hands that the professor was off on a hunt for fabulous treasure on the Spanish Main.

Trouble had broken out in mid-ocean. The crew had sent a committee to the professor formally to demand a share in the treasure. This, of course, had been denied for the very excellent reason that the trip was not making a treasure hunt. Its object was purely scientific, its destination, that naturalists’ paradise, the Upper Amazon. But the crew, their minds inflated by hopes of gold and jewels, professed to believe that they were being tricked. No words of Captain Sprowl, an old Yankee mariner, could convince them to the contrary. Under the leadership of Mart. Medway, the bristly-moustached man, and Luke Hemming, his lieutenant in mischief, they had been ugly for weeks.

This led to Captain Sprowl’s bluntly telling them that on arrival in America, to which he was shaping his course for that purpose, they would all be discharged and new men taken on in their places. This did not suit the men at all. Driven wild by dreams of wealth they broke into open mutiny a short time after the professor had sent his wireless despatch to Mr. Chadwick. Led by Medway and Luke Hemming, they insisted that the yacht be held on her course for South America. A refusal to do so resulted in so much trouble that the yacht had been navigated as close to the shore as was safe, and the guns fired for aid when they saw in the distance what they thought was the Baking Pan Life Saving Station. What followed then, we already know.

Of course it took a long time to explain this with the primitive means at the command of those who had so unexpectedly got into communication. It was a matter of vast joy to Jack, though, to know that his father was uninjured and in good spirits, although, so Mr. Chadwick had tapped out, those on the other side of the partition were as much in doubt as to their ultimate fate as were the boys themselves.

By the time it was deemed prudent to cease communication for the time being, there was an angry sea running outside. Once a big green wave climbed the yacht’s side and swept in a torrent into the boys’ cabin. They had to close the port-hole and this made the tiny place almost insufferably stuffy. The motion, too, of the yacht as she plowed through the rising sea made Dick feel uncomfortably squeamish. Luckily, both Jack and Tom were good sailors and felt no inconvenience.

Night had fallen and the cabin was plunged in darkness, but nobody came near them. There was an electric globe in the cabin, but when Jack tried to turn it on he found that the current had been cut off. From outside the door they could hear the buzz of voices, but were not able to distinguish words. Presumably Medway and Hemming were in consultation. But even though the boys tried their utmost to hear something, hoping that it might shed some light on their ultimate destiny, the complaining of the laboring ship and the low tone in which the men’s voices were pitched, prevented any eavesdropping.

And so the hours wore on, the prisoners from time to time communicating by tapping in the Morse code. This, in itself, made the dreary, dark hours more endurable for the boys. As it grew later it was evident by the frantic pitching of the yacht that a tremendous sea must be running outside.

From time to time they could hear the rush of heavy feet on the deck overhead and thought they could catch the sound of hoarse shouts.

“Gracious!” exclaimed Tom, after an unusually heavy lurch had sent him staggering across the cabin, “there must be a whopper of a storm outside.”

“Yes, indeed,” agreed Jack, “she’s pitching like a bucking bronco. Wow! Feel that!”

The Valkyrie appeared to climb heavenward, pause for a thrilling instant, and then rush down—down—down as if she would never stop.

“Oh-h-h-h-h-h!” groaned Dick in an agony of sea-sickness, “is she going to the bottom?”

“No danger of that,” responded Jack with a confidence he was far from feeling, “this old tub has been around the world before now, and an off-shore gale isn’t going to finish her.”

“Wo-o-f!” groaned Dick, “I wish it would. This is what I get for snoopin’ around where I have no business to be. Oh-o-o-o-o!”

All at once there came to them, above the uproar and confusion of the storm, the sound of the “telegraph” at work. Jack was alert in an instant.

“What is it?” he tapped back.

“The professor says,” came the reply, “that the cabin next to you on the other side and the one you are now in used to be all one stateroom. A partition was put in some time ago of which the new crew knows nothing. It was so fitted that it could be moved out if necessary. Maybe if you can find out how it works,—he has forgotten,—you can get out when the time arrives.”

This was news indeed. There was, then, a way of escape out of their prison if they could find it. But with a moment’s reflection came another thought.

Even if they did get out, they could do nothing against twenty men and two officers. But, just the same, Jack made a mental note of the information, resolving to investigate. A time might come, as his father had suggested, when they could put it to practical use. That day was to come sooner than any of them expected.

But until dawn brought light it was useless to think of examining their prison. The darkness that enveloped them was velvety in its denseness. Only by a sense of touch could they find their way about. And so, tossed and tumbled by the violent motion of the yacht, faint and heart-sick from want of food and doubt as to what was to become of them, the boys passed the night as best they could. At times they slept fitfully, only to waken to hear the shrieking of the wind and experience the sickening plunges of the buffeted yacht.

The first chilly gray light that preceded the dawn was stealing into the cabin when, without warning, the motion of the engine suddenly stopped. They felt the yacht struggle like a wounded thing as the seas broke over her. Then her motion changed. Like a water-logged craft she began to tumble and roll in the trough of the waves.

“Are we sinking?” cried Tom, wakening from a doze with a start.

“I don’t know what’s happened,” rejoined Jack, “but it looks to me as if the machinery had broken down.”

“In that case we’re in a mighty bad fix?”

“About as bad as we can be. A few hours longer in the trough of this sea will break us up and send us to the bottom.”

The boys regarded each other with white, frightened faces. There was something terrifying in the realization that the yacht had ceased to struggle with the waves. It was as if, despairing of weathering the storm, she had given up the struggle.

Suddenly the door was flung open. The form of Medway, shrouded in dripping oil-skins, stood framed in the doorway. He looked haggard and worn and, at least so Jack thought, not a little frightened.

“You kids understand machinery?” he asked roughly, holding on to the door-frame to steady himself against the yacht’s crazy rolls.

“A little,” responded Jack.

“Then come with me, and no monkey tricks if you want to get out of this alive,” he shot out, brusquely.

“Only you two. Not that red-headed kid,” he added, as all three of the boys arose to follow him.

---

[CHAPTER VII.]
THE BOYS FIND NEW JOBS.

Wonderment was the feeling uppermost in the minds of both Jack and Tom as, clutching at hand-holds and rails, they followed their conductor. He led the way up the companionway and to the deck, with a gruff caution to “hang on” when they came into the open.

The warning was necessary. A wind that seemed to force their breath back down their throats was sweeping across the sea, which, running mountain high, looked grim and pitiless, under the pallid gray dawn. No land was in sight, nothing but giant combers amidst which the yacht seemed no more than a helpless chip. Looking at the sea the boys found themselves wondering how the craft had kept above water as long as she had. But almost immediately when they emerged on deck their attention was distracted from the sea and from every other impression but one.

Lashed firmly to the boat deck on top of the main cabin house, was an object that made their hearts give a glad bound.

The Wondership, securely lashed, had been hoisted there and, so far as they could make out, no damage had been done her.

Jack gripped Tom’s arm.

“She’s all right, after all,” he exclaimed hoarsely, as if that was the only thing that really mattered.

Tom decided to venture on a question.

“You hoisted her on board?” he half shouted above the screeching wind to Medway.

“Yep,” was the brief reply. “Thought we might use her someway, so we made a tackle fast under her and hauled her aboard by the main cargo derrick.”

“That was mighty decent of you,” cried Jack warmly.

“Don’t fuss yourself,” was the rough rejoinder, “it warn’t done to please you.”

As Medway spoke, he turned into a doorway in the after part of the cabin house. From the hot smell of grease and oily machinery that arose from it, the boys knew that it led to the engine-room. They climbed down a steel-runged ladder and soon found themselves amidst a maze of polished rods, cams and levers. But the triple expansion engine was idle.

Hardly had they had time to notice this, when they saw that on a leather-covered bench set against the steel wall a man was reclining. His face was white and covered with sweat. His hand was bandaged and one of his legs was doubled up. From his expression of mute agony it was plain that he had been painfully injured.

“Judkins, the engineer,” explained Medway, with a sidewise jerk of his head. “Condenser went out of business a while ago. He got busted tryin’ to fix it. Think you boys can run this engine?”

Jack looked dubious. Tom said nothing.

“I can give ‘em a hand,” said Judkins in a weak voice.

“That’s enough then,” said Medway briskly, as if it was all settled. “Understand,” he said, turning to the boys, “it’s a case of life or death. The sea is increasing. If we don’t get going pretty soon, it’s down to Davy Jones for all of us.”

“But we don’t know anything about steam engines; very little, that is,” protested Jack, although both boys had, in addition to their other studies gone in for a course of steam engineering at the “Tech.” But that course, a sketchy one at best, had only comprised stationary engines.

“Well, Judkins can tell you what you want to know. The first thing to do, I guess, is to get that condenser going.”

“I had her going when I slipped and fell under the crank shaft,” said Judkins weakly. “All she needs is a union on that copper piping and she’ll be all right.”

He indicated the condenser and the place where the union would have to be attached.

“There’s a tool kit and fittings yonder,” he said, pointing to a bench affixed to the bulkhead that divided the engine-room from the stoke hold. A glance at the gauges affixed to this showed Jack that, at any rate, they had a good head of steam. The high-pressure boilers of the Valkyrie were carrying one hundred and seventy-five pounds.

Medway saw his glance.

“Lots of steam,” he vouchsafed; “only thing to do is to get her going. Remember, it’s that or the bottom of the deep blue sea.”

For reasons that the boys did not learn till later, the Valkyrie did not carry an assistant engineer. When the old crew had been set ashore at Madeira there was no chance to secure such an officer, and so she had proceeded to sea with Judkins as the only skilled man in her engine-room. No doubt it was the severe strain he had been under that had caused him to become careless and receive the injury which had disabled him.

Jack’s natural quickness at mechanics enabled him to see what was required on the condenser after a few words of explanation. This done he and Tom ascended to the starting bridge and applied steam to the engines. It was no easy task to carry out these operations on the rolling, wallowing yacht. But at last, as Jack turned on the steam and Tom applied the starting power, they were rewarded by the sight of the cranks slowly revolving.

Suddenly a loud clang close by his head startled Jack.

“All right, come ahead!” hailed Judkins, “Easy now!”

Medway in the pilot house had felt the quiver of the started engines and had given the signal. Jack allowed the engine to pick up revolutions gradually until, at half speed, they were heading into the big seas with the screw turning regularly and powerfully. When this was done Judkins closed his eyes, lay back, and slipped off into unconsciousness. Tom, alarmed, ran through the bulkhead door into the fire-room. Here he found the stokers at work. There were three of them and he sent one on deck after Medway. It was plain that something would have to be done for Judkins at once. Medway soon appeared. It seemed that the man, in a rough way, was a bit of a surgeon. At any rate he declared that he could care for the injured man and had him carried above by two of the crew.

Not long after, the same two men appeared with food for the boys. They did full justice to the meal, unembarrassed by their queer situation. After it had been despatched, Jack noticed Tom’s sleepy looks. In fact the younger of the two lads could hardly keep his eyes open.

“You lie down on that bench and take a nap,” ordered Jack, “I’ll stand watch.”

“But what about you?” inquired Tom drowsily.

“Oh, I’ll be all right. Just you lie down now and I’ll wake you in a couple of hours. I guess we’ll have to hold down this job for some time and we might as well go at it scientifically,” was Jack’s rejoinder.

Five minutes later Tom’s snoring was keeping time with the rhythmic pulsing of the engine as the Valkyrie battled with the storm.

---

CHAPTER VIII.
“THIS IS THE FINISH.”

As Jack had prophesied, they did have to “hold down the job for some time.” In fact, dating from the morning on which Medway escorted them to the engine-room of the Valkyrie, the two boys entered on what was perhaps the strangest period of their lives in many respects. Virtually prisoners, they yet found a certain pleasure in oiling, running and ministering to the big engine. Their innate love of machinery found full play during the following days and nights.

The gale blew itself out after two days, but they still were kept at their posts. Medway had ordered two cots provided for them, and their meals were served below. On trying to reach the deck for a breath of air, after a long vigil at the engine, Jack found that the engine-room was well guarded. At the door was stationed a husky sailor who roughly told the boy to “get back where he belonged.” He had no choice but to obey.

In this way the days went by, the boys taking watch and watch, four hours on and four off. Medway or Hemming visited them regularly, but made no comments, nor did they vouchsafe any information as to the whereabouts of the yacht. Had the boys only known how the other prisoners were faring, and what was ultimately to become of them all, they might have been almost happy in their jobs as young engineers. But as things were, their constant anxiety on these scores outweighed any pleasure they found in running the machinery of the yacht.

Judkins evidently was still confined to his bunk. At least he did not put in an appearance. And so, day after day went by and the yacht forged steadily on, and the boys, working in the engine-room, had no means of knowing her course or destination; for, unlike some craft, the Valkyrie carried no “tell-tale” compass in her engine-room.

Thus two weeks passed. Two weeks of absolute calm, so far as the boys could judge, during which the yacht was forced forward at her full speed capacity, which was eighteen knots. It was one day toward the end of Jack’s watch when the thing happened which was to lead them all into the jaws of disaster.

During the time that he had been on duty the boy had noticed that the engine kept slowing down. Impatient janglings from the pilot house he met as best he could with more steam. But at length even this resource failed. It was plain enough that the Valkyrie was losing speed rapidly.

Jack went over the engine with zealous care, but so far as he could see the fault did not lie there. On the contrary, every rod, crank and bolt appeared in good order. Suddenly a thought struck him. He hastened across the steel floor to the gauge on the bulkhead. What it told him caused the boy to emit a whistle of dismay.

The steam pressure had fallen to seventy-five pounds. While he watched, it dropped two pounds more, and the engine slowed down more and more perceptibly.

He threw open the door leading to the fire-room. In that black hole he saw the dim forms of the stokers on duty flitting about like gnomes in the dust-laden darkness. He hailed the nearest of them.

“What’s the trouble?”

The answer came with a grumbling rumble from the half-naked fireman as he threw open a furnace door and stood in the glare of the fire.

“S’ help me bob, kid, there ain’t more’n three tons of coal in the bunkers an’ the boss tole us to keep steam down.”

“Three tons!” echoed Jack. “How long will that run us?”

“Not h’enuff so’s you could nowtice it,” rejoined the Britisher.

“Have you any idea where we are?”

“Yus. Leastways, I ‘eard ‘em torkin’ erbout h’it ‘fore I come on watch.”

“Where are we, then?”

“H’about ten north, fifty west, I ‘eard ‘em a sayin’.”

“That’s where?” asked Jack anxiously. He knew that ten north meant somewhere pretty close to the equator. In fact, for days past he and Tom had discarded all the clothing they could dispense with, for it had grown insufferably hot in the engine-room.

“H’off the cowst h’of South Ameriky somewheres; bloaw me h’if h’I knows where,” was the vague response. “H’all h’I knows h’is that h’if we doan’t get no cowl, we doan’t get no steam.”

A quick step sounded behind Jack. As the footsteps rang out on the metal floor the boy turned swiftly. Medway confronted him.

“What you doing here?”

“Finding out how much coal we had,” responded Jack. “There’s hardly enough steam to run the engines.”

“You get back where you belong,” roared Medway, “and you, you salt-horse-eating Britisher, you get back to your work. D’ye hear me? I’ll have stuff enough down here before long to get us as far as we want to go.”

As Jack once more entered the engine-room these words stuck in his mind. “As far as we want to go.” They must, then, be nearing their destination. And what was to follow? When he awakened Tom the two had a long talk about it without coming to any definite conclusion on the matter.

One thing was positive, steam had been raised again. By what means was evident when the British stoker, who appeared inclined to be friendly, stuck his head through the bulkhead door.

“They’re a-tearing the bloomin’ ship to pieces,” he confided, and then withdrew as Medway’s step sounded on the ladder.

“How’s she workin’?” he asked briefly.

“All right,” replied Jack; “plenty of steam now.”

“Yes; and we’ll have plenty if we tear everything out of the old hooker and leave nothing but the shell,” ground out Medway fiercely.

“Gracious, Tom,” remarked Jack a few minutes later, before he turned in, “I guess they’re stripping the ship of everything that’ll burn. Hark at that?”

Above the rumble of the engines they could hear plainly through the ventilators the crashing of axes on deck, as the vandals in charge of the yacht hacked down anything that would burn, in their mad desire to reach whatever haven they were aiming for. But if the boys could have been on deck they would have perceived a strong reason for these desperate efforts to keep the yacht moving. Out of the south there was coming toward them a dread harbinger of the terror of those waters.

A sickly-looking yellow halo around the sun, a sullen heaving of the sea, which was of an odd, metallic hue, and a queer odor in the atmosphere, which was still as death,—all these signs, coupled with an alarming drop in the barometer, showed those in charge of this ominous voyage that a tropical hurricane was fast approaching, and that for the second time since the boys had come on board her the Valkyrie was in for a battle for existence.

But of all this, of course, they knew nothing. All they realized was that it was insufferably hot in their oily, murky engine-room. From time to time they were compelled to go to the funnel-shaped bottom of one of the ventilators to get even a breath of air. Medway or Hemming kept dodging up and down all day, and each time they appeared their faces were furrowed more deeply with anxiety.

It was about the middle of Tom’s watch, namely five-thirty in the afternoon, that the boy, without the slightest warning, was lifted almost off his feet by a heavy lurch of the ship. He saved himself from slipping into the revolving machinery only by clutching at an upright stanchion. At the same instant his ears were assailed by a diabolical screeching, as a wind, like the blast from a furnace mouth, was forced down the ventilators. It was an unearthly sound; a bedlam like that which might have been the fitting accompaniment of a witches’ frolic.

Jack, fast asleep on the couch, was rolled violently off it and grabbed by Tom in time to save him from tumbling into the crank-pit.

“W-w-w-what is it?” gasped the newly awakened boy, his eyes wide with amazement at the inferno of noises.

“I guess it’s a hurricane,” came Tom’s response, “and we’re running the engines on furniture!”

As he spoke, the Valkyrie appeared to be lifted skyward by a giant hand and then pushed violently down again to an abysmal depth.

“A few more of those and—good-night,” spoke Jack, whose face had grown pale as ashes.

The next few hours were filled with terror. Medway, revolver in hand, stationed himself in the fire-room, keeping the terrified stokers at work on pain of instant death. Into the furnaces of the hurricane-driven ship was piled everything aboard that would burn. Boats were ruthlessly smashed, costly mahogany and ebony trim and panelling, chairs, tables, anything, everything that was combustible.

The boys toiled as if in a nightmare. Half stunned by the violence of the vessel’s movements, sick, dizzy and aching in every limb, they kept at their tasks. But not long before midnight the end came with the suddenness of a thunder-clap. No time was left for thought even, much less preparation.

They felt the Valkyrie lifted bodily upward and then rushed downward again with appalling force. There followed a crash that seemed to be sufficient to smash the stout structure of steel and iron into a mass of junk. The boys felt themselves hurled bodily across the engine-room by some unseen force.

Then came a shout. It was Medway’s voice.

“Everyone for himself!”

The boys rushed on deck, not knowing what to expect. After that appalling crash they hardly knew if the Valkyrie was yet actually under their feet.

“Whatever has happened, this is the finish!” gasped Jack as they went.

---

[CHAPTER IX.]
ASHORE.

Arrived on deck it did not take the boys long to realize what had happened. The yacht was aground, but whether on a reef of rocks or on the shore was not at first plain. Suddenly a blinding flash of lightning showed them the true situation. The Valkyrie lay with her bow ashore amidst what appeared to be a confused tangle of roots and low growing shrubs. More than this it was impossible to make out. One thing alone was clear—only too clear,—the voyage of the yacht was over. She lay canted far over to one side, making it a difficult matter to stand steadily on her sloping deck.

The crew were running about as if possessed. Any slight amount of discipline that Medway and Hemming might have exercised over them had vanished in this emergency. Some of them were actually trying to get one of the two remaining boats over the side regardless of the mountainous sea that was running. The play of the lightning was incessant. The whole sky appeared to be ablaze with livid fire. In the blue glare the figures on deck were outlined as plainly as if on the screen of a moving picture theatre. But it was grim, real-life drama that was being enacted.

The boys saw Medway and Hemming, with revolvers in their hands, go slipping and sliding across the inclined deck and rush into the midst of the group of seamen about the boat.

“Drop those falls, you fools!” they heard Hemming shout above the tempest. “It’s death to launch a boat in this!”

But the panic-stricken sailors appeared not to notice the two mates. They struggled with the boat and, finally, actually succeeded in getting it overboard. Then they piled into it helter skelter. Some of them fell overboard in their eagerness, but by the glare of the lightning the boys could see that those in the boat dragged them on board again before they were sent to the bottom.

A huge wave came bearing down on them and lifted the boat high in the air. The boys uttered a shout of alarm. It looked inevitable that the boat would be smashed to bits against the yacht’s side. But those on board her managed to stave the frail craft off, and in a minute another big sea swept the little boat with her load of human beings off into the darkness beyond their ken.

Medway and Hemming stood leaning out over the bulwarks peering into the night. They were shouting something, but the boys could not hear what.

The furious wind caught their words and hurled them broadcast before they had properly left their lips.

“Is she breaking up?”

Tom shouted the words into Jack’s ear as the two boys, clinging to the shrouds, stood on the inclined deck.

“I don’t think so,” was Jack’s reply, yelled with his hands to his mouth, funnel-wise, “she’s grounded so far on shore that she’s safe for the time being, anyway.”

“We’d better go below and see how the others are getting on,” came from Tom the next minute.

In their excitement and fright the boys had utterly forgotten for the time being their companions. The thought of the plight that they might be in now recurred to them with redoubled force. Slipping along the precipitous deck they made their way to the cabin companionway. As they went they noticed the marks of the relentless axes of the crew. Except the main cabin house amidship, the yacht had been practically stripped of every bit of available timber. She looked, as indeed she was, a sorry derelict.

It is now necessary to turn back a little and discover how the prisoners in the adjoining cabin had been faring. It will be recalled that when Jack and Tom had been summarily taken from the cabin they shared with Dick Donovan, the next stateroom was occupied by Mr. Chadwick, Professor Von Dinkelspeil and Captain Sprowl.

The two weeks that had been spent by the boys in the engine-room had passed like eternity to those locked in the cabins. Of course, they had been able to communicate by means of the “Morse” tappings. But Dick’s knowledge of telegraphy was so limited that he had not been able to understand much of what was communicated to him. Nor had he been able, except after a long interval, to explain to the others that Jack and Tom had been taken from the cabin for some unknown reason connected with the machinery of the yacht.

Food had been served to the prisoners regularly, but from the sailors who brought it they had received no word of the fate of the two boys, nor could even the promise of bribes elicit a word from the men. Under the strain of their captivity and their uncertainty concerning Jack and Tom, Mr. Chadwick’s health had suffered seriously. Dick, too, had suffered from a kind of tropical fever, and lay in a semi-conscious condition in his cabin for days. This was the more unfortunate as Professor Dinkelspeil had given, through Mr. Chadwick’s telegraphy, full instructions to the young reporter concerning the movable partition.

It had been agreed by the prisoners that Dick should remove the partition and get into the next cabin. There was a chance that the door would be open, in which case Dick might make his way into the main cabin and unlock their door in which they knew the key was kept. What they would do after this was not arranged; but they all felt that if they could get out they might find some way of bettering their situation.

Dick’s illness interfered with these plans; but the night that the storm broke he had forced himself to rise from his bunk, and despite his weakness he determined to try to remove the partition separating him from the next room. It was in panels, as he knew, and with the aid of his knife, which, luckily, the men in possession of the yacht had not thought worth taking from him, he succeeded in removing the screws that held one of the panels in place.

He lifted the panel out and found himself looking into the next cabin.

It was brilliantly lighted and, to his astonishment, the walls were lined with racks in which were rifles and pistols. It was, in fact, Medway’s cabin, to which he had removed the yacht’s armory so as to have it out of the way of any of the crew who might take it into their heads to form a second mutiny.

While the yacht rolled and plunged in the hurricane, Dick climbed through the hole made by removing the panel. Once in the cabin he stood stock still, undetermined what to do. After a minute’s reflection he decided to see if the door would open. But he had hardly taken a step with this intention in view when the door was flung violently open and Hemming stood before him.

For one instant both stood perfectly still. Dick’s knees shook under him. Even in his usual health he would have been no match for the burly Hemming, but as it was he felt incapable of putting up even the most feeble resistance.

“You young imp of Satan, what are you doing in here?” bellowed Hemming, with a snarl like an angry tiger.

He raised his fist and sprang forward. Dick, more by instinct than anything else, seized one of the pistols hanging on the wall. Hemming paused as the boy leveled the weapon at him. But the next instant he sprang forward as if to fell the boy to the ground. Dick jumped back to avoid a heavy blow and his finger involuntarily pressed the trigger.

A click resulted, but there was no explosion.

The weapon was unloaded. With a shout of triumph Hemming rushed him, but just as his hands were on Dick’s throat there came a stunning crash that hurled them both to the floor.

When Dick, who had rolled under a bunk with the force of the upheaval, regained his feet, he was alone in the cabin. Dazed and half stunned, he stood still trying to collect his thoughts. Suddenly there came a mighty pounding on the wall of the cabin he had just left. This was accompanied by muffled shouts.

“Help!” was what Dick made out above the uproar about him.

He rushed to the door which Hemming had left open behind him. The lights in the main cabin were still on and showed him that the lower part of the place was awash with water. He had hardly time to realize this discovery when the lights went out and the place was plunged in total darkness.

---

[CHAPTER X.]
THE CASTAWAYS.

Dick had a mind that worked quickly. It did not take him long to arrive at an approximately correct idea of what had happened. The yacht was ashore; and the water lapping about the lower part of the cabin showed that she had stove a hole in her bottom or else strained her plates so badly that the water was rushing in.

Suddenly the frantic pounding on the wall of the cabin which held Mr. Chadwick and his fellow prisoners recommenced. The shouting, too, was now plainly audible, for above the door opening into the main cabin was a small grating for purposes of ventilation.

“Help! help! The cabin is half full of water,” cried the imprisoned men.

“Gracious! They’ll drown if I don’t do something and do it quickly!” flashed through Dick’s mind.

All at once he felt his feet grow wet; the water already had reached half way up the steeply inclined cabin floor. There was not a minute to lose. He started for the cabin door, hoping to find a key in the outside of it, when footsteps sounded on the companionway stairs.

“Who’s there?” he yelled.

The response that came back through the darkness caused his heart to give a bound of delight.

“Jack Chadwick and Tom Jesson. That you, Dick?”

“Yes, yes, yes! Hurry up, fellows! Your dad and the rest of them are in that cabin, Jack, and the place is awash. The water’s gaining every minute.”

The boys groped their way to his side in a jiffy. There was no time for greetings just then. The three lads rushed for the door of the cabin in which Jack’s father and the others were imprisoned. But a shock awaited them. There was no key in the outside of the door. Nor did it yield to Jack’s furious poundings.

“Dad! dad! are you all right?” cried the boy.

“Thank Heaven it’s you, Jack!” came from within. “Get this door open somehow, will you? The water in here is rising all the time.”

“Yes,—yes,” responded Jack, feeling about desperately for some means of opening that door.

While he did so, the three boys were almost thrown off their feet by the sudden settling of the yacht as she subsided more deeply into the land which she had struck.

In the darkness some object came rolling across the cabin floor. It struck Jack’s knees, inflicting a painful blow. But the boy gave a simultaneous exclamation of delight.

“Hurrah! Here’s just the thing!” he cried, “one of the cabin chairs. They must have unscrewed it to feed the furnaces with.”

He stooped and picked it up.

“Stand back from the door inside there!” he shouted as he swung it over his head and brought it smashingly against the wood. Again and again his strong arms brought the heavy iron support of the swivel chair against the cabin door. At the fourth stroke the wood splintered, and in a few seconds the door was fairly burst from its hinges and three men rushed out from within, followed by a gush of water. The break in the yacht’s side had occurred in the plates outside the cabin in which Mr. Chadwick and his companions were confined. When Jack released them the water had already risen above the lower berth and was pouring in in an ever increasing stream. Fifteen minutes later and the boys might have been too late.

It was no time for explanations. The cabin floor was more steeply inclined than ever since the fresh subsidence of the stranded craft, and they made for the companionway stairs. As they reached the deck, Jack noticed that even in the brief space of time that they had been below, the wind had perceptibly decreased in violence.

But the lightning still played vividly, and in its glare they saw two figures advancing toward them. They were Medway and Hemming. Both had revolvers in their hands.

“Get back down below!” shouted Medway, as he drew near.

“But the whole place is awash!” cried Jack indignantly. “The deck is the only safe place.”

“I don’t care. You get below or——”

A sailor, one of the few left on board since the dereliction of the rest of the crew, approached Medway, and pulling his arm to attract attention, said something to him.

“Keep back there, you,” cried Medway with a threatening flourish of his pistol.

Then he and Hemming turned and followed the sailor to the stern of the boat. The group of rescued prisoners remained where they were. In the mood Medway was in, it didn’t appear safe to interfere with his wishes, and as they could not have bettered their condition by following the man, they made no move to do so.

While they stood there, talking in low tones and discussing their perilous situation, the storm perceptibly weakened in force. Like most tropical hurricanes it had spent its fury in a few hours and was now sweeping north, having inflicted irreparable damage to the once staunch yacht. In another hour’s time the wind had died down to a stiff breeze, and the sea was no longer raging as it had when the Valkyrie struck.

“I vunder vot has become of dot feller Medvay?” said the professor presently. “Ach! dot rascal, he has broken my beautiful yachts und ruined mein expedition.”

“It is odd that he doesn’t show up,” said Mr. Chadwick.

“I haven’t noticed anyone about for some time,” declared Tom. “I wonder what has become of him. Maybe he is up to some fresh mischief.”

“Dunno as there’s much more the pesky varmit kin do,” commented Captain Sprowl, a down-easter from Maine, and the veteran of many tempestuous voyages. “Consarn him,” he went on angrily, “he’d look uncommon well decorating the end of a yard arm, according to my way of thinking.”

“I know a few that ought to keep him company,” declared Jack, the way in which they had been treated rankling within him. “Tell you what,” he continued presently, “I’m going to have a look about the deck.”

“Be careful,” warned his father, “those rascals are capable of any mischief.”

“As if Tom and I didn’t know that!” responded Jack. “But I’ll be on the lookout, dad. Don’t worry. Come on, Tom.”

The two boys made off into the darkness which was now illumined only by an occasional fitful flash from the departing storm. It was some little time before they returned. When they did the news they brought gave the little party a galvanic shock.

“They’ve gone! Deserted! Left us cold!” cried Tom.

“What!” cried his uncle.

“That’s right,” confirmed Jack. “The stern boat, the only one that was left, is missing from the davits. They must have waited for the sea to go down and then made off, leaving us to our fate.”

“Wa’al, cuss their blue-nosed pelts!” roared Captain Sprowl. “I’d give all I have to get my hands on ‘em for jus’ erbout ten seconds.”

But neither the captain’s righteous wrath nor the just indignation of the rest of the deserted party could disguise the fact that they were left, boatless and marooned on a craft leaking like a sieve, castaways on an unknown coast.

---

[CHAPTER XI.]
ABOARD THE WRECK.

The morning dawned as only a perfect tropic morning can. The sea was as smooth as glass. Not a cloud was to be seen as a reminder of the elemental fury of the preceding night. The sun, as it rose, a huge red ball above the rim of the sea, showed them some things about their situation that were calculated to give them good cause for worry.

In the first place, it must be said that there was not a sign of the two boats to be seen. For anything that appeared of them, they might never have existed. Indeed, on that calm, serene dawn the fantastic events of the wild night that lay behind them did seem very much like the distorted experiences of a nightmare. But their haggard, anxious faces, and the pitiable condition of the Valkyrie, bore eloquent testimony to the fact that all that had passed was only too true.

As a matter of fact, the night’s incidents proved to be only minor matters for consideration in view of one greater fact that now confronted them. The Valkyrie lay with her bow well up amidst a tangled mass of low-growing jungle. Her stern, from just forward of midships, was almost under water. Even a casual inspection showed that if the sea should rise again it was not all unlikely that she might slide off into deep water and sink.

But the most astonishing thing about this land which they had struck was that they could see across it and to either of its limitations. It was, in fact, an island, stranded there out of sight of all other land. In shape it might have been likened to a splash of gravy on a plate, so irregular in form was it. As to dimensions, it was probably a quarter of a mile across, and perhaps twice that in length.

“This explains something that has been puzzling me,” exclaimed Mr. Chadwick, as they made this discovery. “It’s plain enough now that the crew knew there was no land to be expected in this part of the ocean, and when we struck they at once assumed that we had encountered some uncharted rock and so took to the boats.”

This explanation threw some light on the desertion of the yacht by means of the boats, for it had occurred to all of them that if the yacht had struck on the coast of the mainland there would not have been such a precipitate rush to leave her.

“My idea is to look in the pilot house and overhaul the charts,” said Captain Sprowl, after some discussion had ensued as to the best course to follow. “Our course must be marked till noon yesterday, anyhow, and we can find out about where we are.”

Whatever may have been Medway’s other faults, he could not have been called a slovenly navigator. The course of the yacht was plainly marked up till eight bells of the day preceding, and showed that they were then off the coast of Brazil. Captain Sprowl “overhauled” the pilot house some more, and at noon made an observation with a sextant he had unearthed. After making some calculations, the results of which were awaited with an eagerness that may be imagined, he announced that the position of the yacht was about one hundred and fifty miles from shore, and a little to the south of the mouth of the Amazon River.

“Himmel,” cried Professor Von Dinkelspeil, his frog-like eyes gleaming through a huge pair of horn-rimmed spectacles, “dey vos bringing us rightd vere I vanted to go!”

“Yes,” said Mr. Chadwick, “the professor’s destination was the Amazon River, but I must await his leave before telling you what his exact object was in coming to this part of the world.”

“Treasure, wasn’t it?” hazarded Dick Donovan.

“I’m afraid you have a reporter’s love of the picturesque,” smiled Mr. Chadwick. “Yet I suppose it was treasure of a kind; but not of the sort that the misguided crew imagined.”

“It’s this pesky island that puzzles me,” grunted Captain Sprowl, bending over the chart and knitting his brows. “There isn’t anything like it marked here, and this chart is based on the very latest survey made by the British cruiser, Charybdis.”

“Maybe it was too small to mark down,” suggested Jack.

“That shows all you know about navigation, my boy,” rejoined the blunt old sailor. “An island like this, stuck right bang out in the track of ships, wouldn’t be left uncharted.”

“And yet it was solid enough to knock a hole in us,” said Tom. “It must have been here right along.”

Captain Sprowl’s rejoinder was an astonishing one.

“Now d’ye know, I ain’t so all-fired sure of that,” said he.

“You think it is of volcanic origin?” asked Mr. Chadwick.

“No sir-ee, not by a jugful. You see, we are somewhere’s off the mouth of the Amazon River. A bit to the south maybe, but the drift sets south. Did you ever hear of the floating islands of the Amazon?”

“Yes,” rejoined Mr. Chadwick, while the others said nothing, “but I always thought that they were more or less of a myth.”

“Not so’s you could notice it,” was the reply. “I’ve heard tell of bigger ones than this. They get detached from the upper reaches of the river during floods and are carried out to sea. They’ve been met with much further out than this, and a dern sight bigger, too. They’re perfectly good islands, they say, except for one thing.”

“What’s that?” asked Jack, for the captain had paused as if he expected someone to put a question.

“Why, they’ve got a mighty oncomfortable habit of sinking. You see, they ain’t much more than a sort of big door mat held together by twisted roots and so forth, and when they get good and soaked through—down they go.”

“Blitzen! Den you dink dot dis island may go py der bottom?” gasped the little professor.

“Wa-al, it wouldn’t surprise me,” rejoined the captain, producing a pipe and filling it leisurely. When it was lit and drawing, he supplemented this remark:

“We’ve got to get ashore, gents.”

“That’s plain enough,” said Mr. Chadwick, “but unless some ship picks us up, how are we going to do it?”

“Why, as I onderstand, these boys here have a sort of fly-with-me-swim-with-me boat, ain’t they?” asked the captain. “What’s the matter with our using that?”

It was odd, and goes to show how confused the average human mind may become in a big emergency, but up to that moment not one of them had thought of the Wondership. Her awkward bulk was still secured on the top of the midship cabin house, and as far as could be seen she was undamaged.

“But the rent in the gas bag?” objected Mr. Chadwick.

“I guess we can fix that,” volunteered Jack. “Some canvas and pitch will make a patch that will hold.”

“Plenty of those aboard,” said the captain. “Now, I tell you what we’ll do. We didn’t have much of a breakfast, and we’re all as empty as a whale that ain’t struck no fish. Hungry folks can’t do good work. Give me a crew with full stomachs and I’ll take a lumber raft across the ocean. I’ll turn to with Dick here, and cook up a good meal. The boys kin overhaul their Johnny-jump-up, yonder, and the professor and Mr. Chadwick can get to work selecting supplies and so on to stock the thing with. For we may land, if we land at all, in some place where they ain’t got no hotels to welcome shipwrecked strangers.”

The captain’s suggestions met with unanimous approval, and while Jack and Tom clambered up to inspect the Wondership, the others scattered on their various tasks. As they worked, Jack and Tom from time to time took a look at the island on which the yacht rested. It might have been that their imaginations were quickened by what the captain had said, but it appeared to them that the bushes at the water’s edge were gradually subsiding into the sea.

If this actually were the case, there was need for quick work, for the floating island was all that was keeping the Valkyrie above water. If, as the captain feared, the island subsided, the yacht would go with it to the bottom beyond the shadow of a doubt.

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[CHAPTER XII.]
IN DIRE PERIL.

It was mid-afternoon by the time that the ripped bag had been patched with canvas, carefully sewn with stout waxed thread and then pitched with a resinous mixture compounded by the captain. By this time, too, the lockers had been filled with provisions from the yacht’s pantry, many of them in concentrated form especially selected by the professor for his projected expedition, the object of which still remained a mystery.

When this had been done, there was nothing left to be accomplished but the launching of the Wondership. The sea remained smooth, but without question the island was sinking rapidly. This made the need for haste imperative. Yet Captain Sprowl allowed nothing to be slighted. Maps of the district where they expected to land, navigating instruments and the ship’s chronometers were placed on board. The professor’s papers were found to have been stolen from his cabin, which had been ransacked from floor to roof; but, luckily, his most important documents he carried on his person.

As for clothes, they could take only what they had on; for when the work of loading was complete, the Wondership carried a pretty heavy cargo, besides the six persons who were to travel in her. This number, too, was augmented by a seventh in the person of Judkins. Feeble groans from his cabin had led to the discovery that the injured man had been left behind by his companions. He was carried out and placed in the machine before it was launched so as to lose no time later in hoisting his helpless form over the side.

The tackles by which the craft had been hauled on board luckily remained intact, and by passing the ropes around a hand winch they found that they could hoist her into the air and drop her gently upon the water. The list of the ship aided the transfer materially, and the work of immediate preparation for their adventurous trip occupied but a small portion of an hour.

When all was in readiness and the Wondership floated alongside, they descended by the companionway, and a few minutes later the engine was started. As they glided off to the westward, they noticed that the island was almost awash. Before they had gone five miles, nothing was visible but the masts of the yacht and her yellow funnel. Within ten minutes more these, too, had vanished, and they knew that the Valkyrie had ended her last cruise. They were alone on the ocean.

Their plan was to keep on a due westerly course, which would bring them in time to land, without fail. Once landed, the proposal was for a part of the castaways to strike off and seek out a town or village where aid might be procured. Aside from this, their plans had been left to such circumstances as might confront them on the Brazilian shore.

The bulky machine did not draw as much water as might have been anticipated, owing to its broad displacement and the lightness of the metal of which it was built. In fact, under different circumstances, the voyagers would have enjoyed the novel experience. Except for the hum of the propeller at the fore-end of the craft she moved noiselessly through the water. All vibration and jar were absent, and the motion could only be compared to that of some gracefully gliding water bird.

“What speed are we makin’?” asked Captain Sprowl, who was leaning back in his cushioned seat smoking luxuriously like a magnate in his motor car.

“About twenty miles an hour,” was Jack’s reply after a glance at the speed-registering device, which formed one of numerous dials and instruments attached to the dash-board. As Tom had once remarked, the dash-board of the Wondership looked “like the bridge of a battleship,” what with its compasses, registers and meters of various kinds.

“That ought to bring us in sight of shore before very long,” commented the captain, “I’d like to land before dark. This coast ain’t very thickly inhabited, so far as I know, and them as do live there may not have a very hearty ‘welcome’ on their door mat for us.”

“We’ve got plenty of rifles and ammunition,” declared Tom boldly, “in case anyone attacks us.”

“A good way to keep out of trouble, son, is not to go lookin’ for it,” was the captain’s response, “and anyhow, what good ‘ud your rifles be in a thick forest of trees with some sort of a savage behind each of ‘em?”

Tom looked abashed and said nothing. But Dick struck in with a question.

“There are savages ashore, then?” he asked.

“Wa’al, I ain’t sayin’ no and I ain’t sayin’ yes,” said the captain evasively; “but Brazil is full of river Indians, and at certain times of the year they come down to the coast to get turtles’ eggs and fish and so forth; and I’ve got a notion in the back of my head that they ain’t just as gentle and refined as they ought to be, ‘specially where they see a chance to get a little loot.”

Nothing more was said for some time, and the Wondership forged smoothly and steadily ahead. Suddenly the captain, who had been looking over the side, drew their attention to the water.

“Look down there,” he said, “if you boys want to see a rare sight.”

They all peered over and saw, swimming slowly along in the translucent water, a large, whitish-colored fish with a huge protuberance of some kind sticking out from its head.

“By the plunging porpoises of Portugal,” exclaimed Dick Donovan, “what under the sun is it?”

“A sword-fish?” hazarded Jack.

“That’s right, lad, and an old slapper, too. My! That sword of his must be five feet long if it’s an inch. Look at the spikes sticking out from it!”

“Jimminy! I’d hate to get rammed by that,” cried Tom, gazing down at the great fish with its odd, bony sword.

“Gracious! If he ever took it into his head to attack us, he’d soon make a hole in the bottom,” cried Jack the next moment, as the sword-fish gave a quick twist of its tail and darted ahead.

“Plenty of cases have been known of sword-fish attacking ships,” declared the captain. “In 1894, the whale ship Mary Ambree came into New Bedford with a big sword from a sword-fish stuck into her port quarter. It had broken off and was rammed about six inches into the wood. The fish that owned it must have died on the voyage up and rotted from its weapon.”

“That’s a peril we didn’t count on,” said Mr. Chadwick. “It would be a mighty serious matter for us all if that fish was to ram us, either by intent or mistake.”

“Maybe so vee bedder go py de air up,” said the professor, a trifle nervously.

“It might be a good time to test that patch, anyhow,” declared Jack.

He turned on the gas inlet, and with a rush and hiss the bag began to fill. But he shut it off before sufficient buoyancy was obtained to lift them. He did not wish to waste gas unnecessarily, for although an extra supply of the gas-making material was on board, still there was not any too much of it.

The patch appeared to hold perfectly. So interested were they all in seeing if this vital part of the craft was to prove efficient, that none of them paid any attention to what was going on about them.

It was Dick Donovan who excitedly called their attention at length to a great commotion on the water ahead of them. The sea was boiling up almost as if a volcano had suddenly opened beneath it. Then from the midst of the confusion, a great spout of water shot heavenward as if it had been projected from some mighty fountain.

“It’s a whale!” shouted Captain Sprowl, who had served his time in the “fishery,” as it is called.

“Himmel! So idt is!” cried the German naturalist. “Ach! A big vun, too! Blitzen, see him!”

As he uttered these excited cries the whale leaped from the water,—“breached,” as it is called by whale-men. High into the air the huge form, fully eighty feet in length, rose much as though the colossal fish were imitating a leaping salmon. As it settled back with a mighty crash that sounded like the report of a cannon, a second and much smaller whale leaped from the water.

“It’s an old whale and her calf!” shouted the captain. “Oh! if I had a harpoon!”

“Poys, dot is a sight vot iss not possible to be seen efery day,” exclaimed the professor enthusiastically.

“Well, I hope they don’t decide to investigate us,” spoke Dick Donovan, “I’d as soon have the Flatiron Building coming alongside.”

“They’d make mincemeat of us sure enough,” declared the captain, “but I guess they won’t make trouble for us. It’s mostly the old bulls that attack boats. Cows is peaceable enough if you leave ‘em alone.”

“Be very sure that we’ll leave her ladyship yonder alone,” laughed Mr. Chadwick.

As he spoke there was a sudden swirl in the water ahead of them where the two whales were swimming side by side, the young one close to its mother. Then came a smother of foam and then the water alongside the swimming mammoth was dyed crimson.

“It’s the sword-fish!” cried Mr. Chadwick. “He’s attacked the whale!”

“No, it’s the calf he’s after!” shouted the captain. “Hail Columbia! Now look out fer squalls!”

“Say!” cried Tom, “we’d better get away from here. Look, the big whale is turning on the sword-fish! There’ll be some waves here in a jiffy that will swamp us, if we don’t look out.”

“That’s right,” agreed the captain, “get this craft up in the air if you can, Jack. There’s nothing worse on land or sea than an old cow whale whose calf has been injured.”

As he spoke, the big whale rushed at the sword-fish whose ivory weapon had impaled her young one. Her great flukes struck the water with resounding crashes, making waves that threatened to swamp their craft.

“Get up! Get up!” roared Tom. “We’ll be swamped!”

Jack turned on the gas full power, but the ship did not rise. Her heavy load made her sluggish.

“Start her!” bellowed the captain. “Start her for your life!”

“I can’t! She won’t rise!” cried Jack despairingly.

“Then we are lost. Look there!”

Coming toward them at the speed of an express train was the huge whale. On she drove, making straight for the stranded motor ship.

“She’s going to attack us! She thinks that we killed her young one!” cried Mr. Chadwick.

The motor ship lay straight in the path of the maddened whale. As they regarded the fury of the oncoming creature with apprehensive eyes, they could almost feel the terrible impact and the struggle for life that must ensue when the leviathan struck their frail craft.

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[CHAPTER XIII.]
ATTACKED BY A WHALE.

On came the whale. She was a huge, humpbacked monster, with a gigantic square head that looked as solid as the prow of a battleship. Every instant appeared to increase the speed at which she traveled. Fascinated by terror they could not take their eyes off the onrushing peril,—with the exception, that is, of Jack.

The boy was struggling with an auxiliary valve for gas supply which had been installed with the idea of quick-filling the bag. But the ordinary valve had worked so well alone that the auxiliary had not been used, and it was jammed and corroded.

“Hurry! hurry!” shouted Tom. “She’ll ram us in another second!”

But still the ship would not rise. The bag was swelling every instant, though, and it seemed that if they were granted only a molecule more of time there might be a possibility of rising before the whale struck them.

Among other things, the Wondership had been provided with conveniently placed life preservers. Jack now shouted to the others to put these on.

“When she hits, jump outwards!” he yelled.

They began to adjust the life saving contrivances, which laced on like jackets. But before they had them half ready the whale was within a few feet of the craft. Such was her speed that in front of her there was a mighty mass of blue water piled up. Her blunt, square forehead had raised the billow just as a round-bowed ship will “push the river in front of it,” to use a graphic sailor phrase.

And now an astonishing thing happened. The wave struck the frail motor ship a few seconds before the impact of the whale’s head. The great sea gave the craft just the impetus that was required. Buoyed up by the inflated gas-bag the wonder craft rose into the air as the wave rolled under her, and hung suspended in that element for some minutes. She did not rise far above the water, but the five or six feet that she reached was sufficient to clear the onrushing whale.

As the huge, humped back with its ugly rough hide passed under them Captain Sprowl picked up a rifle and pumped an unmerciful stream of lead into the monster.

Instantly she spouted, and the boys and their companions found themselves in the midst of a downpour of water and vapor. But the main danger had almost miraculously been avoided. As the Wondership settled down to the water once more, the whale could be seen rushing blindly on. A cheer went up from the boys.

“That’s the time we fooled her!” cried Tom exultantly.

But Captain Sprowl urged Jack to get the bag fully inflated as quickly as possible.

“She’ll be back afore long,” he prophesied. “She’s as mad as Pharaoh’s sow right now, and she won’t give up as easy as all that.”

Sure enough, in a few minutes the mound of water that marked the whale’s progress could be seen returning toward them at the same rapid speed. But by this time, Jack had secured a wrench and had managed to turn the stubborn auxiliary valve. As the whale neared them, he set the rising planes and started up the propeller.

The motor craft hesitated, and then like a wind-driven leaf she shot upward. It was not an instant too soon. As her rudder rose drippingly from the sea, the whale rushed viciously under her. Another fraction of a second and there would have been a different ending to this story.

“Saved, by the great horn spoon!” roared out Captain Sprowl. “Lad, that gas-meter thing of yours worked just in time.”

“It certainly did,” agreed Jack, ordering Tom to set the rising planes at a sharper angle.

“Look!” shouted Tom suddenly as they shot upward, soaring above the smooth surface of the ocean. “The sword-fish is going to attack the whale herself, now.”

They saw, far below them, the sword-fish’s ivory blade, stained red from its attack on the baby whale, rushing at the old cow. She gave battle bravely. In an instant the waters were lashed into such a fury that they could see nothing of the details of the battle.

But Professor Von Dinkelspeil, who had brought his binoculars with him from the wreck, determined, in the interests of science, to see all he could of the battle. He leaned far over the side.

“Ach! vot a sight! I nezzer saw such a dings!” he cried. “Oh! I vish I hadt a camera!”

“I’ve got mine,” cried Dick. “I’ll take a picture!”

The red-headed young journalist leaned out over the edge of the Wondership and tried to get a focus on the furious battle beneath.

“Look out, you’ll overbalance!” called Tom.

But the good advice came too late.

Without the slightest warning to give them a chance to save him, Dick Donovan’s body pitched over the side of the craft and fell like a stone downward through space.

For an instant the shock of the occurrence held them all spellbound. Then they woke into action with a series of shouts and cries that made inextricable confusion.

“Send us down! Send us down!” cried Mr. Chadwick.

“I daren’t,” declared Jack, “those creatures would certainly ram us.”

“Quick! Help him!” cried Tom, who had been leaning over watching the spot where Dick had vanished. It was not far from the place where the two monsters of the sea were battling, some two hundred feet beneath the flying ship.

Jack’s face was pale, but his manner was determined as he shut off the engine and ordered Tom to get out the grapnel rope. This was a rope some five hundred feet in length, of light but exceedingly strong fiber. At its end was a grapnel, a sort of four-forked anchor. The idea of it was to anchor the Wondership in case of a high wind or other emergency.

Tom produced the rope and Jack flung off his garments down to his underclothes. While he did this Tom had, in obedience to his chum’s orders, made the rope fast to an interior stanchion of the ship.

“See if you can spot him,” Jack said to Tom when the rope had been made fast.

“Yes! Yes! I see him!” cried Tom excitedly, as he looked over the side. “The life-jacket is floating him but he looks half drowned. He can’t strike out to save himself.”

“The fall must have stunned him,” cried Mr. Chadwick; “it’s a good thing he had that life-jacket on!”

Jack began climbing over the side, holding on to the rope that now dangled from the floating air craft.

“What are you going to do?” demanded Tom, who up to this moment had imagined that Jack meant to catch Dick by the grapnel.

“I’m going down after Dick,” was the quiet response as the boy shot down the rope toward the sea beneath. “Keep an eye on that rope, Tom, and haul up when I tell you!”

“Ach! dey vill both be killed!” cried the professor frenziedly. “Dis iss madtness!”

But Jack Chadwick was not a boy who did things without having first figured them out. As he slid down the rope he knew just what he meant to do when he touched the water.

In the meantime Dick’s body, buoyed up by the life-belt he had so luckily neglected to remove, was floating on the surface. About an hundred feet off, the whale and the sword-fish were battling furiously.

In mid-air the Wondership hung suspended, her white-faced, frightened passengers peering over the side, while between the air-buoyed craft and the sea Jack Chadwick’s body swung on the thin rope like a pendulum.

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