Mickey did not propose to undertake it until convinced that no other scheme was open to him. In going about the cave, he struck the walls in the hope of finding some weak place, but they all gave forth that dead sound which would have been heard had they been backed up by fifty feet of solid granite. Among the many schemes that he had turned over in his mind, none gave as little promise as this, and he dismissed it as utterly impracticable. He could conjure no way of reaching that opening above their heads. He could not look up at that irregular, jagged opening without thinking how easy it would be to rescue them, if they could make their presence known to some one outside. There was Sut Simpson, who must have learned that he had gone upon the wrong trail, and who had, therefore, turned back to the assistance of his former comrade. The latter knew him to be a veteran of the prairie, one who could read signs that to others were like a sealed book, and whose long years of adventure with the tribes of the Southwest had taught him all their tricks; but whether he would be likely to follow the two, and to understand their predicament, was a question which Mickey could not answer with much encouragement to himself. Still there was a possibility of its being done, and now and then the Irishman caught himself looking up at the “skylight,” with a longing, half-expectant gaze. There were several other schemes which he was turning over in his mind, none of which, however, had taken definite shape, and, not wishing to discourage his young friend, he answered his question as best he could. “Well, my laddy, we're going to have a hard time to get out, but I think we'll do it.” “But can you tell me how?” Mickey scratched his head in his perplexed way, hardly feeling competent to come down to particulars. “I can't, exactly; I've a good many plans I'm turning over in my head, and some of them are very fine and grand, and its hard to pick out the right one.” Fred felt that he would like to hear what some of them were, but he did not urge his friend, for he suspected that the fellow was trying to keep their courage up. They had finished their meal, and were sitting upon the sandy soil, discussing the situation and throwing an occasional longing look at the opening above. They had taken care to avoid getting directly beneath it; for they had no wish to have man or animal tumble down upon their heads. Now and then some of the gravel loosened and rattled down, and the clear light that made its way through the overhanging bushes showed that the sun was still shining, and, no doubt, several hours still remained to them in which to do any work that might present itself. But, unfortunately, nothing remained to do.