"Then, I presume, he must sit up and watch over himself. But what's the use of one of us keeping guard here?" "Why not?" "We are in this cavern-like arrangement, where no one can come upon us from the rear, while the fire will ward off danger from the front." "Suppose that danger comes in the form of an Indian; what would he care for half a dozen fires?" "But there are no unfriendly Indians in these parts." "You are thinking of Motoza. We have agreed that he is friendly, but sometimes I suspect we are making a mistake about him." The boys would have been glad to convince themselves that it was safe to dispense with guard duty, for a night of undisturbed rest was exceedingly tempting, but no one who starts out with the set purpose of deceiving himself can do so. The result of it all was that the two decided that they must stand guard between them until the sun rose. On such occasions the sentinel whose turn comes first has the preferable task, since every one will admit that it is easier to keep awake before midnight than afterward. The division was made more equitable by arranging that Jack Dudley should serve until two o'clock, and Fred Greenwood for the remainder of the morning. Before the hour of ten the younger lay down on the flinty floor, with his heavy blanket gathered around him, and sank into slumber. They had matched pennies for the first turn, else the elder would not have claimed it. Jack found his duty similar in many respects to that of his first night on the prairie, but the surroundings and circumstances were in wide contrast. In the former instance they had the companionship of the cowman and veteran hunter, while now they could not know whether he was within a half-dozen miles of them. Jack, however, did not believe that anything in the nature of danger impended, and that to a great extent he was taking upon himself an unnecessary hardship. So far as he could judge, the only possible thing to fear was wild animals. There were always some of them prowling through this region, but at that season of the year the wolves and other brutes were not pressed by hunger, and no matter how fierce the creature, he would not attempt to pass the mouth of the cavern so long as the fire was burning. Jack flung a number of sticks on the blaze and then passed outside, where he was beyond the circle of light. Standing thus, in the gloom of the night, he felt that the experience of that hour was worth the journey across the continent. There was an impressive grandeur in the solitude that he had never felt before. On every side towered the immense peaks of one of the loftiest spurs of the grandest mountain chain of America. The crests resembled piles of blackness, with the stars gleaming behind them, while he, an insignificant atom, stood with gun by his side in one of the tiny hollows, as if to guard against attack from the sleeping monsters.