“I say—” He moved in the direction Caldwell had been going, then he stopped with a gasp, the shout died on his lips and for the moment Jim was too paralyzed to make a move.

About half way between the plane and the rim of the woods he saw three tall natives, their bodies naked except for the tiger-skin and the grass belt such as the ancient had worn; their heads adorned with a high dress of peacock feathers whose many colors shone brilliantly in the sunshine, in one hand each held a long spear with a glistening point, while the other held a number of small, deadly-looking darts. One of the men had an arm raised, his body was bent slightly toward the woods, and from his extended hand shot the javeral, cutting sharply like a hissing knife through the air, and to Jim’s horror, it was flying faster than the eye could travel, toward young Caldwell’s unsuspecting back.

CHAPTER II.
Kidnapped

As Bob Caldwell pursued his botanistic observations along the edge of the dense forest, his mind was filled with keen regret that he could not spend several weeks in the neighborhood with plenty of reference books to aid him in recognizing the numerous varieties of vegetation which surrounded him, and he also regretted the fact that they had found the old Indian, or whatever he was, in the neighborhood because of course that meant that the spot was not so isolated as it appeared and in all likelihood there were others living close by. But for the appearance and disappearance of the mysterious old man the Flying Buddies would not have felt the need of such caution and he could have been confident that it was safe to penetrate a little way into this paradise of tropical growths and perhaps find something they could take back to Texas. It was disappointing, but at the same time he had to admit that it was doubtless better that they had discovered him immediately; better than thinking they were secure then running into a hostile tribe without warning.

Since they had come to South America the Buddies had encountered so many dangers in wild, out of the way sections that it had developed their bumps of caution to a high degree. To be sure the authorities had quietly ascertained that Arthur Gordon was still laid up with a broken leg at the home of the doctor who had taken him in charge after the accident in the snowy fastness of the Andes, and Ynilea, the Laboratory man at the Don’s had said that the Big Boss, frightened at the repeated disasters which had befallen many of his men and undertakings, had taken himself out of the country, but the Sky Buddies were convinced that this chap, whoever he was, had made up his mind to fathom the secrets and secure possession of the vast wealth. While the loss of a few lives might make him get away, to save his own skin, he would probably recuperate his weakness, reorganize his band and start in again at the first opportunity.

“The Big Boss, I reckon would get back to the United States, or to his own hangout, wherever it is, cure himself of his scare, then begin all over again. Getting possession of unlimited wealth, he’ll figure, isn’t to be passed up, and this time he’ll cook up some schemes that may work better than the others.” Bob grinned to himself at the idea, then through his brain flashed the memory of the wonderful laboratories with their numberless workers and scientific advantages. “Then again, maybe they won’t. I’m betting my dimes on the Don.”

With that comforting assurance, Caldwell turned his attention to his job, moving slowly and occasionally glancing across to where his step-brother waited patiently beside the plane. He thought that Jim was mighty decent to hang around doing guard duty when he would probably have liked to do some studying himself, and resolved to cut his observations as short as possible. With that in mind he snipped leaves, tiny branches, bits of root, and made rough notes to which he could refer later when there was more time. Nearly two hours had been consumed and the younger boy had made half the circuit when he reached a section where there were almost no large trees, although those which grew on both sides were so heavy with branches and foliage that the arch above was as thick as a roof. In the space there seemed to be more fallen trees and rocks than elsewhere. Besides, there was a good deal of young growths, slender saplings and brush, also rather a heavy hanging, like a great curtain of vines suspended from the limbs above. The appearance of this semi-clearing made Bob suddenly remember the way they had once gone to the Laboratory with Ynilea. That day, the party had started from Cuzco by automobile, left the main thoroughfare, traversed an unmarked route over rocks and foot hills, finally leaving the machine and making their way through a well-concealed natural hallway until at last they came out on a ledge from which they were taken in a strange airplane the rest of the journey.

“Great Christoper’s ghost, wonder if this is another of those hidden ways,” he exclaimed excitedly, and forgetting for the moment the need to be cautious, he stepped on to a broken stump in among the protecting curtain. But, before he could advance another inch, his quick ear caught a sharp whistling sound which he thought must have come from Jim’s lips, but before he could turn about, something dark cut in under his arm, hit the nearest sapling and drove like the blade of a stiletto clean through its heart. The young tree quivered from the impact and in an instant tiny beads of sap oozed from the wound.

“Whew—” Bob waited a moment, too startled to think, then he managed to turn about, and his eyes nearly popped out of his head. In the first place, it seemed to be snowing for the air was filled with fluttering white things which seemed to be struggling to go on, and although they looked like butterflies, the boy was sure he must be mistaken for he had never seen nor heard of anything like it. Through the queer storm he could see Jim crouched near the helicopter, the looped lariat hanging from one hand and his mouth open as if he had been about to yell a warning which had frozen on his lips. Quickly Caldwell’s eyes swept to where Jim’s were staring and instantly he understood from whence the murderous dart had been driven. He saw the three Indians, two of them facing him while the third had his gaze fixed on Austin. One of the men held a second dart in his hand and was slowly raising it above his head prepared to send it with deadlier aim than the first.

Then, as if some supernatural power had intervened, the fluttering white things dropped thickly into the space, completely filling it with their bedraggled bodies and helpless beating wings. As Bob stood a bit back in the protection of the swinging vines it was like observing the strange spectacle through a window. None of the insects landed within a couple of feet of him, but beyond the air was like a swirling blanket which effectively cut him off from sight of the Indians plainly determined to kill him. Anxiously the boy wondered about Jim, for he could no longer see anything but the butterflies, and through his mind raced half a dozen plans.