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Presently he came to a place where Wildfire had doubled on his trail and had turned up a side canyon. The climb out was hard on Slone, if not on Nagger. Once up, Slone found himself upon a wide, barren plateau of glaring red rock and clumps of greasewood and cactus. The plateau was miles wide, shut in by great walls and mesas of colored rock. The afternoon sun beat down fiercely. A blast of wind, as if from a furnace, swept across the plateau, and it was laden with red dust. Slone walked here, where he could have ridden. And he made several miles of up-and-down progress over this rough plateau. The great walls of the opposite side of the canyon loomed appreciably closer. What, Slone wondered, was at the bottom of this rent in the earth? The great desert river was down there, of course, but he knew nothing of it. Would that turn back Wildfire? Slone thought grimly how he had always claimed Nagger to be part fish and part bird. Wildfire was not going to escape.

By and by only isolated mescal plants with long, yellow-plumed spears broke the bare monotony of the plateau. And Slone passed from red sand and gravel to a red, soft shale, and from that to hard, red rock. Here Wildfire’s tracks were lost, the first time in seven weeks. But Slone had his direction down that plateau with the cleavage lines of canyons to right and left. At times Slone found a vestige of the old Indian trail, and this made him doubly sure of being right. He did not need to have Wildfire’s tracks. He let Nagger pick the way, and the horse made no mistake in finding the line of least resistance. But that grew harder and harder. This bare rock, like a file, would soon wear Wildfire’s hoofs thin. And Slone rejoiced. Perhaps somewhere down in this awful chasm he and Nagger would have if out with the stallion. Slone began to look far ahead, beginning to believe that he might see Wildfire. Twice he had seen Wildfire, but only at a distance. Then he had resembled a running streak of fire, whence his name, which Slone had given him.

This bare region of rock began to be cut up into gullies. It was necessary to head them or to climb in and out. Miles of travel really meant little progress straight ahead. But Slone kept on. He was hot and Nagger was hot, and that made hard work easier. Sometimes on the wind came a low thunder. Was it a storm or an avalanche slipping or falling water? He could not tell. The sound was significant and haunting.

Of one thing he was sure–that he could not have found his back trail. But he divined he was never to retrace his steps on this journey. The stretch of broken plateau before him grew wilder and bolder of outline, darker in color, weirder in aspect and progress across it grew slower, more dangerous. There were many places Nagger should not have been put to–where a slip meant a broken leg. But Slone could not turn back. And something besides an indomitable spirit kept him going. Again the sound resembling thunder assailed his ears, louder this time. The plateau appeared to be ending in a series of great capes or promontories. Slone feared he would soon come out upon a promontory from which he might see the impossibility of further travel. He felt relieved down in the gullies, where he could not see far. He climbed out of one, presently, from which there extended a narrow ledge with a slant too perilous for any horse. He stepped out upon that with far less confidence than Nagger. To the right was a bulge of low wall, and a few feet to the left a dark precipice. The trail here was faintly outlined, and it was six inches wide and slanting as well. It seemed endless to Slone, that ledge. He looked only down at his feet and listened to Nagger’s steps. The big horse trod carefully, but naturally, and he did not slip. That ledge extended in a long curve, turning slowly away from the precipice, and ascending a little at the further end. Slone drew a deep breath of relief when he led Nagger up on level rock.