It took an effort not to keep on gazing. But Slone turned to the grim business of his pursuit. The trail he saw leading down had been made by Indians. It was used probably once a year by them; and also by wild animals, and it was exceedingly steep and rough. Wildfire had paced to and fro along the narrow ridge of that saddle, making many tracks, before he had headed down again. Slone imagined that the great stallion had been daunted by the tremendous chasm, but had finally faced it, meaning to put this obstacle between him and his pursuers. It never occurred to Slone to attribute less intelligence to Wildfire than that. So, dismounting, Slone took Nagger's bridle and started down. The mustang with the pack was reluctant. He snorted and whistled and pawed the earth. But he would not be left alone, so he followed. The trail led down under cedars that fringed a precipice. Slone was aware of this without looking. He attended only to the trail and to his horse. Only an Indian could have picked out that course, and it was cruel to put a horse to it. But Nagger was powerful, sure-footed, and he would go anywhere that Slone led him. Gradually Slone worked down and away from the bulging rim-wall. It was hard, rough work, and risky because it could not be accomplished slowly. Brush and rocks, loose shale and weathered slope, long, dusty inclines of yellow earth, and jumbles of stone--these made bad going for miles of slow, zigzag trail down out of the cedars. Then the trail entered what appeared to be a ravine. That ravine became a canyon. At its head it was a dry wash, full of gravel and rocks. It began to cut deep into the bowels of the earth. It shut out sight of the surrounding walls and peaks. Water appeared from under a cliff and, augmented by other springs, became a brook. Hot, dry, and barren at its beginning, this cleft became cool and shady and luxuriant with grass and flowers and amber moss with silver blossoms. The rocks had changed color from yellow to deep red. Four hours of turning and twisting, endlessly down and down, over boulders and banks and every conceivable roughness of earth and rock, finished the pack-mustang; and Slone mercifully left him in a long reach of canyon where grass and water never failed. In this place Slone halted for the noon hour, letting Nagger have his fill of the rich grazing. Nagger's three days in grassy upland, despite the continuous travel by day, had improved him. He looked fat, and Slone had not yet caught the horse resting. Nagger was iron to endure. Here Slone left all the outfit except what was on his saddle, and the sack containing the few pounds of meat and supplies, and the two utensils. This sack he tied on the back of his saddle, and resumed his journey.