CHAPTER II

A CURIOUS INSTRUMENT

"What's the matter, Bud?" asked Dick, as he urged his animal forward in a jump, until he was beside his cousin.

"Some one's up there around the tunnel entrance," responded Bud Merkel. "I saw 'em dodge back out of the light." Then, raising his voice, he cried: "Come on, now! None of your tricks! I've got you covered!"

"I don't see any one," spoke Nort.

"They're there, all right," asserted Bud. "Come on, fellows," he exclaimed, "we'll have to look into this. There was trouble enough with getting water to stay in Happy Valley, without letting some Greaser in to queer the works again! Come on!"

He and his cousins rode their horses up the rather steep and winding trail that led from the bottom of the reservoir to the top, where a big iron pipe, sticking out under the mountain like the head of some great serpent, brought from the distant Pocut River a stream, without which it would have been impossible to raise cattle in the valley the boy ranchers claimed as particularly their own.

"Who you reckon it is?" asked Nort, as his pony scrambled up between the animals of Dick and Bud.

"Oh, some prowler that may have been rustling our grub while we were over at the round-up," was the answer.

"They couldn't get any cattle, for there aren't any to get," observed Dick. This was true, as all the animals had been driven from Happy Valley over to Diamond X. Later such as were not shipped away, and many of the calves and mavericks would be returned to fatten up and grow in readiness for the spring tallying.

"I don't just like this!" murmured Bud, as he again urged his pony forward. "Have your guns ready, fellows!"

And while they are thus riding toward the place where a strange tunnel pierced Snake Mountain, I shall take this opportunity to present, more formally than I have yet had a chance to do, my new readers to the boy ranchers. For that is what Bud Merkel, and Nort and Dick Shannon called themselves, being that, in fact.

Bud was a western lad, the son of Henry Merkel, who had been a ranchman all his mature years. He lived at Diamond X ranch, with his wife and daughter Nell. Some time before this present story opens Bud's cousins from the east had come to spend the summer with him, while their father and his wife made a trip to South America.

Nort and Dick, though "tenderfeet" at the beginning, had quickly fallen into the ways of the west, and in the first volume of this series, "The Boy Ranchers," I was privileged to tell you how they helped solve a mystery that revolved around Diamond X.

This mystery had to do with two college professors, and a strange, ancient animal. But it would not be fair to my new readers to disclose, here, all the secrets of that book.

So successful was the first summer which Nort and Dick spent at their uncle's ranch, that they were allowed to repeat it the following season. But this time there was a change. As related in the second volume, "The Boy Ranchers in Camp," Mr. Merkel had, by utilizing an ancient underground water-course beneath Snake Mountain, and by making a dam in Pocut River, brought water to a distant valley he owned.

This valley was originally called Buffalo Wallow, the source of the name being obvious. But once water was brought through the underground course, and piped to a reservoir, whence it could be distributed to drinking troughs for the cattle, and also used to irrigate the land, it enabled a fine crop of fodder to be grown. With the bringing of the water to Buffalo Wallow, or Flume Valley, as Bud called the place, it was possible to do what had never been done before—raise cattle there. Bud's father let him take this valley ranch as his own, and Nort and Dick were boy partners associated with their western cousin, Mr. Shannon putting up part of the needed capital to make the start for his sons.

All would have gone well except for the mysterious stoppage of the flow of water, which stoppage, if continued, would mean disaster.

How the water fight at Diamond X Second (as the valley ranch was sometimes called) ended, and how the strange mystery was solved, is the story in the second volume, and I absolutely refuse to go into more details about it here. It would not be playing the game square.

At any rate the water was finally turned back into the underground tunnel, and then, in order to better guard this vital necessity, Mr. Merkel had the entrance to the tunnel boarded up—egress being possible only when heavy doors, at either end, were unlocked.

I might say that while the tunnel was the old water-course of a vanished river, the shaft under the mountain appeared, in. ancient times, to have been used by the Aztecs, or some Mexican tribes, for hiding their store of gold away from the Spaniards. There were secret passages and rooms in the tunnel, to say nothing of hidden water gates.

Who had constructed these, and what actual use had been made of them was, of course, lost in the dim and ancient past. But that it was the Aztecs, or some allied race, was the statement of learned men who examined the tunnel.

After the water fight at Diamond X Second had terminated in favor of the boy ranchers, and great copper levers that operated the hidden water gates had been removed, the tunnel was boarded up, and was now seldom entered.

But now, as Bud and his cousins rode back from the big round-up, and the western lad had, as he thought, seen some one sneaking about the forbidden gate, there was a feeling of apprehension in the hearts of himself and cousins.

They had now reached the top level of the reservoir which held a storage supply of water. The reservoir was a great semi-circular bank of earth and atones, wide enough on top for two to ride abreast.

"I don't see any one," remarked Nort, straining his eyes to pierce the gloom and shadows into which the face of the tunnel and the locked gate were thrown by the moonlight and clouds.

"Nor I," added Dick.

"Well, I saw some one!" insisted Bud. "It was a man, as sure as snakes, and he seemed to be trying to open the big gate."

This gate was made of heavy bolted planks and was set on hinges in a jamb of other planks and boards that closed the reservoir end of the tunnel water-course. A similar barrier and big door was at the Pocut River end.

"Well, if he was here, he seems to be gone," observed Nort "Maybe it was a sheep herder, Bud."

"Well, if any of that gentry think they can drive their flock over here, and water their woolies at my expense, they're mistaken," declared Bud with emphasis. "Sheep men have to be, I reckon, but they're out of place in a cow country. Hello, there!" he called, loudly. "Come on out and show yourself!"

But there was no answer, and the only sound, aside from the creaking of the damp saddle leathers, was the splashing of water as it flowed from the big pipe and into the reservoir.

"Guess he lit out," observed Bud, thrusting his gun back into the holster.

"Or else you didn't see him," chuckled Nort. "Maybe your eyes are full of dust, same as mine are, from that round-up."

"Oh, I saw somebody all right!" declared Bud. "Might 'a' been one of Buck Tooth's Indian friends making a call, but—"

He suddenly ceased speaking and leaned over in his saddle to gaze earnestly at something on the ground. It was something that glittered and shone in the mystic moonlight as Nort and Dick could see. "What's that?" inquired the latter.

In answer Bud slipped from his saddle and picked up the object which the moonlight had revealed.

"What in the world is this?" asked the boy rancher, as he held up a curious instrument. "Is this the start of another mystery!"