It was the horse-hunter's passion that reminded him of his pursuit. The deer trail led down through a break in the wall. Only a few rods of it could be seen. This trail was passable, even though choked with snow. But the depth beyond this wall seemed to fascinate Slone and hold him back, used as he was to desert trails. Then the clean mark of Wildfire's hoof brought back the old thrill. "This place fits you, Wildfire," muttered Slone, dismounting. He started down, leading Nagger. The mustang followed. Slone kept to the wall side of the trail, fearing the horses might slip. The snow held firmly at first and Slone had no trouble. The gap in the rim-rock widened to a slope thickly grown over with cedars and pinyons and manzanita. This growth made the descent more laborious, yet afforded means at least for Slone to go down with less danger. There was no stopping. Once started, the horses had to keep on. Slone saw the impossibility of ever climbing out while that snow was there. The trail zigzagged down and down. Very soon the yellow wall hung tremendously over him, straight up. The snow became thinner and softer. The horses began to slip. They slid on their haunches. Fortunately the slope grew less steep, and Slone could see below where it reached out to comparatively level ground. Still, a mishap might yet occur. Slone kept as close to Nagger as possible, helping him whenever he could do it. The mustang slipped, rolled over, and then slipped past Slone, went down the slope to bring up in a cedar. Slone worked down to him and extricated him. Then the huge Nagger began to slide. Snow and loose rock slid with him, and so did Slone. The little avalanche stopped of its own accord, and then Slone dragged Nagger on down and down, presently to come to the end of the steep descent. Slone looked up to see that he had made short work of a thousand-foot slope. Here cedars and pinyons grew thickly enough to make a forest. The snow thinned out to patches, and then failed. But the going remained bad for a while as the horses sank deep in a soft red earth. This eventually grew more solid and finally dry. Slone worked out of the cedars to what appeared a grassy plateau inclosed by the great green-and-white slope with its yellow wall over hanging, and distant mesas and cliffs. Here his view was restricted. He was down on the first bench of the great canyon. And there was the deer trail, a well-worn path keeping to the edge of the slope. Slone came to a deep cut in the earth, and the trail headed it, where it began at the last descent of the slope. It was the source of a canyon. He could look down to see the bare, worn rock, and a hundred yards from where he stood the earth was washed from its rims and it began to show depth and something of that ragged outline which told of violence of flood. The trail headed many canyons like this, all running down across this bench, disappearing, dropping invisibly. The trail