Daylight found him leaning against a smooth ledge which formed a part of the black capping he had seen from the road. He had spent the night toiling over boulders and into small gulches and out again, trying to find some crevice through which he might climb to the top. Now he was just about where he had been several hours before, and even Casey Ryan could not help realizing what a fine target he would make if he attempted to climb back down the bluff to camp before darkness again hid his movements. Standing there puffing and wondering what to do next, he saw the two burros come picking their way toward the spring for their morning drink and a handful apiece of rolled oats which Barney kept to bait them into camp. The lead burro was within easy flinging distance of a rock, from camp, when the thin, unmistakable crack of a rifle-shot came from the right, high up on the rim somewhere beyond Casey. The lead burro pitched forward, struggled to get up, fell again and rolled over, lodging against a rock with its four feet sticking up at awkward angles in the air. The second burro, always quick to take alarm, wheeled and went galloping away down the draw. But he couldn't outgallop the bullet that sent him in a complete somersault down the slope. Barney might keep the rest of his rolled oats, for the burros were through wanting them. Casey squinted along the rim of black rock that crested the peak irregularly like a stiff, ragged frill of mourning stuff the gods had thrown away. He could not see the man who had shot the burros. By the intervals between shots, Casey guessed that one man was doing the shooting, though it was probable there were others in the gang. And now that the burros were dead, it became more than ever necessary to locate the gang and have it out with them. That necessity did not worry Casey in the least. The only thing that troubled him now was getting up on the rim without being seen. It was characteristic of Casey Ryan that, though he moved with caution, he nevertheless moved toward their unseen enemy. Not for a long, long while had Casey been cautious in his behavior, and the necessity galled him. If the hidden marksman had missed that last burro, Casey would probably have taken a longer chance. But to date, every bullet had gone straight to its destination; which was enough to make any man think twice. Once during the forenoon, while Casey was standing against the rim-rock staring glumly down upon the camp, Barney's hat, perched on a pick handle, lifted its crown above the edge of his hiding place; an old, old trick Barney was playing to see if the rifle were still there and working. The rifle worked very well indeed, for Barney was presently flattened into his retreat, swearing and poking his finger through a round hole in his hat.