But they reached the crest of the slight elevation without having heard anything more of that which had alarmed them. The next moment, however, both caught the dim outlines of a large animal moving slowly from them. Before they were certain of its identity the creature neighed, as if frightened by the stealthy approach of the youths. "It's a horse!" exclaimed Fred, who, suspecting the whole truth, moved over the ridge and called, in a coaxing voice: "Dick! Come here, Dick!" The animal stopped, looked inquiringly around, and then came forward with a pleased whinny. He was Fred's pony, and, brief as their acquaintance had been, recognized his voice. Fred stroked his nose and patted his neck, and the horse showed his pleasure at receiving the endearments. When the youths made their halt and cooked their supper they were on the edge of the grassy plateau for which they were hunting, and whose features they would have been quick to recognize were the sun shining. Soon after, Jack's pony came out of the gloom as if to claim attention, and he received it. "We are more fortunate than I dared hope," said Jack; "here we are at home, after all. I wonder whether Hank is ahead of us?" This was unlikely, since, if he had reached the spot fixed upon as their headquarters, he would have kindled a fire, whereas it was dark in every direction. The partial cavern was on the other side of the plateau, and the boys walked rapidly to it, the route being clear, now that they had located themselves. They appreciated the wisdom of Hank, who had made them help gather enough firewood to last through the night. He said (what proved to be the fact) that they were not likely to return till late, when it would be hard to collect the right kind of fuel. In a brief while a second fire was under way. It was started in front of the cavern, which was of so slight extent that it received and held much of the warmth. Seated within the opening, with their heavy blankets wrapped about them, the boys were thoroughly comfortable. They had met with enough stirring adventure and had had sufficient rough experience to make the rest highly acceptable. They naturally wondered when nine o'clock passed without bringing Hank Hazletine. "Maybe he has lost his way in the canyon," suggested Fred, giving expression to a fancy which was not serious. "You mean that he has forgotten where the stairs lead up to the top?" "I guess that's what I mean, though I never thought of it before. If that is the fact, he may have to pick his way for two or three hundred miles to the mouth of the canyon and then walk back to us." "That will delay his arrival." "Yes. He can hardly be expected before morning." "Let me see," said Jack, becoming more serious; "Hank warned us that no matter where we went into camp, we must keep one person on duty as sentinel." "Suppose we are separated, and there is only one of us in camp?"