Darkness fell some time before the cool night air penetrated the fissure; when it did so the cold seemed likely to be added to his other physical discomforts. In the higher altitudes the nights were distinctly chilly even in mid-summer, and he had on only a light outing shirt, above his waist. As the hour grew late, the cold increased in severity until Wade was forced to walk up and down his narrow prison in the effort to keep warm. He had just turned to retrace his steps, on one such occasion, when his ears caught the soft pat-pat of a footfall on the ground above. He instantly became motionless and tensely alert, wondering which of his enemies was so stealthily returning, and for what reason. He thought it not unlikely that Moran had altered his purpose and come back to shoot him while he slept. Brave though he was, the idea of being shot down in such a manner made his flesh crawl. Stooping, he picked up a fragment of rock; although he realized the futility of the weapon, it was all he had. Certainly, whoever approached was moving with the utmost stealth, which argued an attack of some kind. Drawing back the hand that held the stone, the cattleman shrank into a corner of the fissure and waited. Against the starlit sky, he had an excellent view of the opening above him, and possibly by a lucky throw the stone would serve against one assailant, at least. The pat-pat-pat drew nearer and stopped, at last, on the extreme edge of the hole. A low, long-drawn sniff showed that this was no human enemy. If the sound had been louder, Wade would have guessed that it was made by a bear; but as it was he guessed the prowler to be a mountain-lion. He had little fear of such a beast; most of them were notorious cowards unless cornered, and when presently a pair of glowing eyes peered down into the fissure, he hurled the stone at them with all his might. His aim was evidently true, for with a snarl of pain the animal drew back. But just as amongst the most pacific human races there are some brave spirits, so amongst the American lions there are a few which possess all the courage of their jungle brothers. Actuated by overweening curiosity, or else by a thirst for blood, the big cat returned again and again to the edge of the hole. After his first throw Wade was unable to hit the beast with a stone, although his efforts had the temporary effect of frightening it. Gradually, however, it grew bolder, and was restrained from springing upon him only, as it seemed, by some sixth sense which warned it of the impossibility of getting out of the fissure after once getting in. Baffled and furious, the lion sniffed and prowled about the rim of the hole until the ranchman began to think it would surely leap upon him. He picked up his broken pocket-knife and waited for this to happen. The shattered blade would be of little use, but it might prove better than his bare hands if he had to defend himself against the brute's teeth and claws. CHAPTER XVII