between the walls.  Sometimes he could have tossed a stone down upon a part of the trail, only a few rods below, yet many, many weary steps of actual toil.  As he got farther up the notch widened.  What had been scarcely visible from the valley below was now colossal in actual dimensions.  The trail was like a twisted mile of thread between two bulging mountain walls leaning their ledges and fronts over this tilted pass.

Slone rested often.  Nagger appreciated this and heaved gratefully at every halt.  In this monotonous toil Slone forgot the zest of his pursuit.  And when Nagger suddenly snorted in fright Slone was not prepared for what he saw.

Above him ran a low, red wall, around which evidently the trail led.  At the curve, which was a promontory, scarcely a hundred feet in an airline above him, he saw something red moving, bobbing, coming out into view.  It was a horse.

Wildfire—­no farther away than the length of three lassoes!

There he stood looking down.  He fulfilled all of Slone’s dreams.  Only he was bigger.  But he was so magnificently proportioned that he did not seem heavy.  His coat was shaggy and red.  It was not glossy.  The color was what made him shine.  His mane was like a crest, mounting, then failing low.  Slone had never seen so much muscle on a horse.  Yet his outline was graceful, beautiful.  The head was indeed that of the wildest of all wild creatures—­a stallion born wild—­and it was beautiful, savage, splendid, everything but noble.  Whatever Wildfire was, he was a devil, a murderer—­he had no noble attributes.  Slone thought that if a horse could express hate, surely Wildfire did then.  It was certain that he did express curiosity and fury.

Slone shook a gantleted fist at the stallion, as if the horse were human.  That was a natural action for a rider of his kind.  Wildfire turned away, showed bright against the dark background, and then disappeared.

CHAPTER VI

That was the last Slone saw of Wildfire for three days.

It took all of this day to climb out of the canyon.  The second was a slow march of thirty miles into a scrub cedar and pinyon forest, through which the great red and yellow walls of the canyon could be seen.  That night Slone found a water-hole in a rocky pocket and a little grass for Nagger.  The third day’s travel consisted of forty miles or more through level pine forest, dry and odorous, but lacking the freshness and beauty of the forest on the north side of the canyon.  On this south side a strange feature was that all the water, when there was any, ran away from the rim.  Slone camped this night at a muddy pond in the woods, where Wildfire’s tracks showed plainly.

On the following day Slone rode out of the forest into a country of scanty cedars, bleached and stunted, and out of this to the edge of a plateau, from which the shimmering desert flung its vast and desolate distances, forbidding and menacing.  This was not the desert upland country of Utah, but a naked and bony world of colored rock and sand—­a painted desert of heat and wind and flying sand and waterless wastes and barren ranges.  But it did not daunt Slone.  For far down on the bare, billowing ridges moved a red speck, at a snail’s pace, a slowly moving dot of color which was Wildfire.