The boys remained standing at the mouth of the cavern until the guide disappeared on the other side of the little plateau. Then they looked at each other and smiled.  
"Well, it appears that we are to have another day to ourselves," said Jack; "and we can't gain anything by waiting, so let's be off."
 
Nothing could be more satisfactory to Fred, and the two took nearly the same course as their friend, who passed from sight but a short time before. They had no intention, however, of following him, for that would have been displeasing to the veteran, who, had he desired their company, would have asked for it.
 
Without any definite object in mind, they took substantially the route of the previous afternoon. Sooner than they anticipated, they found themselves on the margin of the canyon that had been the scene of so stirring an experience, but the point where they reached it was deeper in the mountains.
 
"Jack, we can't be very far from that break that Hank spoke of; let's hunt it up."
 
"I am willing; but before we do so we'll peep over the side, to see whether he or anyone else is there."
 
No change was to be noted in the appearance of the tiny stream at the enormous depth, but neither friend nor stranger was in sight. They did not expect to see any one, and began moving along the side of the stupendous fissure in their search for the place where Hank had entered it. From what he said it could not be far off, but they were disappointed before reaching the right point. A gradual descent of the sides was notable, and continued until the depth of the canyon was decreased one-half, while the roar became more audible.
 
"We can't be far from the break," said Jack; "that is, if this descent continues."
 
They found, however, a few minutes later, that it did not continue, but began to increase, until they were fully as elevated above the bottom of the gorge as at the point where they had leaped it. The width also varied continually, sometimes being only three or four feet, while in others it expanded to nearly ten times that extent. They did not pause to look over the margin again, for their aim was to reach the place referred to by their friend.
 
At the moment when they began to wonder whether a mistake had not been made they came upon the break. Both banks sloped downward so abruptly that it would have been laborious for the two to work their way to the bottom, or from the bottom to the top, though the masses of boulders, with the tough pines growing almost the whole distance, offered secure foothold.
 
The picture was an interesting one. At the point where the stream issued from the canyon, its width was about twenty yards. It flowed swiftly, but quickly slackened its pace, since its expansion was fully a hundred feet. This flowed for probably double that distance, when the high banks again appeared, and what may be called the regular canyon was resumed.
 
Jack and Fred sat down to survey the curious picture. They noticed that the canyon seemed to be dotted at intervals with rocks, some of which rose to a considerable height above the current. Many were near one side or the other, while others were in the middle of the swift stream, which dashed against them with a violence that threw the spray and foam high in air. It was easy to believe that Hank Hazletine had made his way up the canyon by leaping from rock to rock, with little more result than the wetting of his shoes.
 
"It might be done in the daytime," said Jack, "but I should not want to try it at night."
 
"The water must be very deep in many places; and flows so fast that the strongest swimmer couldn't help himself. I should prefer to climb the wall, as Hank did."
 
"But that would be dangerous in the darkness."
 
"The best thing we can do is to do neither," observed Fred, with a laugh. "I have a good deal of curiosity to know what led Hank to pick his way up the canyon, but I haven't enough to lead me to follow him——"
 
Jack Dudley suddenly gripped the arm of his friend and drew him back from the boulder on which they had been sitting. Fred nearly lost his balance, and did not know what to make of the proceeding until both checked themselves at a safe distance and cautiously peeped forth. Then the cause of Jack's excitement became apparent.
 
From the pines on the other side of the stream, and near the middle of the depressed portion, three Indians stepped into view. The first anxiety of the youths was to learn whether Motoza was one of them; but he was not. All were strangers.
 
They were dressed much the same as the vagrant Sioux, and, like him, their faces were painted, and their coarse black hair dangled loosely about their shoulders. They were armed with rifles; but two of the weapons seemed to be the long, old-fashioned muzzle-loaders, while the third carried a Winchester. Although they emerged from the pines in Indian file, they spread apart and walked beside one another to the edge of the broad stream, where they stopped, as if that were the end of their journey.
 
Their gestures showed they were talking energetically, though of course not the slightest murmur reached the youths, who took care to screen themselves from view while cautiously peeping forth. Even after the warning words of their guide they felt no special alarm, for they believed the red men were from the reservation near by, and would not harm any one. If they attempted it, Jack and Fred felt they had the advantage of position, sheltered behind the rocks, far above their enemies, down upon whom they could fire with their Winchesters, should the necessity arise.
 
It was quite certain that the three belonged to one of the hunting parties whose signal-smoke the boys had seen earlier in the day. Their action was curious. They did not look up the bank, so that the boys might have been more careless without being discovered; but it was apparent that two of them were arguing with the third, who was more excited than either of his companions. Finally he turned away and made as if to pass up the canyon, after the manner of Hank Hazletine. He leaped out upon one of the rocks, then bounded as lightly to another, and then to a third, which took him within the canyon. The others watched him without protest or action.
 
Evidently the Indian who had started off so hurriedly was more impulsive than his companions, for after his third leap he remained standing on the rock; and, although it would have been easy for him to spring to the next leading up the canyon, he refrained from doing do. Instead, he looked around, and then deliberately rejoined his friends, who showed no surprise over his reverse movement. They spoke only a few words to one another, when they moved back in Indian file toward the growth of pines, among which they passed from sight and were seen no more.
 
"That was a queer performance," remarked Jack; "it looked to me as if that first fellow wanted his companions to go up the canyon with him, and when they refused he started off by himself."
 
"Only to change his mind."
 
"There can be no doubt of that; but it strikes me as strange that there should be something up there to attract them as well as Hank."
 
"Some day Hank will tell us about it. Do you observe, young man, that the forenoon is well along and we haven't had a sight of any game?"
 
With no thought of the Indians whom they had just seen, the boys began retracing their steps. Inasmuch as it was on the other side of the gorge that they had gained the shot at the buck, the feeling was strong that they should pass it again and push their hunt in that direction.
 
It did not require long to find a spot where the fissure was easily leaped. In fact, the exploit was becoming quite an everyday thing with them.
 
"We are not far from the spot where we killed that rattler yesterday," said Fred, recognizing several landmarks. "I wonder whether there are any more near us——"
 
At that instant Fred uttered a gasp and leaped several feet from the ground, while his companion was hardly a second behind him. Both had heard the well-remembered whir at the same moment, and bounded away several steps before pausing to look back.
 
Remarkable as it might seem, a second specimen of the crotalus, fully as large as the other, lay on the flat surface of a rock only a few inches above the ground. Evidently it was sunning itself when thus disturbed by the approach of the young hunters, at sight of whom it threw itself into coil. The boys were not in danger, for the warning was sounded while they were still a number of paces distant.
 
Feeling safe, they stood still and surveyed the hideous thing. They agreed that it was larger than the other, and seemed to be darker in color. But for the fact that the reptiles were on opposite sides of the canyon, it might be believed they were mates. The head and tail were elevated, the latter vibrating with the swift, hazy appearance at the end of the rattles which they had noted before.
 
Jack repeated the oft-quoted expression: "The heel of the woman shall bruise the serpent's head," and added: "I suppose nine persons out of every ten, when they see any kind of a snake, are seized with an impulse to kill it."
&nbs............