The black horse had come far. The glossy coat of him was thickly sprinkled with alkali dust, sifted upon him by the wind of his passage through the desert; his black muzzle was gray with it; ropes of it matted his mane, his forelock had become a gray-tinged wisp which he fretfully tossed; the dust had rimmed his eyes, causing them to loom large and wild; and as his rider pulled him to a halt on the western side of the sand dune--where both horse and rider would not be visible on the sky line--he drew a deep breath, shook his head vigorously, and blew a thin stream of dust from his nostrils. With head and ears erect, his eyes flaming his undying courage and his contempt for distance and the burning heat that the midday sun poured upon him, he gazed westward, snorting long breaths into his eager lungs. The rider sat motionless upon him--rigid and alert. His gaze also went into the west; and he blinked against the white glare of sun and distance, squinting his eyes and scanning the featureless waste with appraising glances. In the breathless, dead calm of the desert there was no sound or movement. On all sides the vast gray waste stretched, a yawning inferno of dead, dry sand overhung with a brassy, cloudless sky in which swam the huge ball of molten silver that for ages had ruled that baked and shriveled land. A score of miles westward--twoscore, perhaps--the shadowy peaks of some mountains loomed upward into the mystic haze, with purple bases melting into the horizon; southward were other mountains, equally distant and mysterious; northward--so far away that they blurred in the vision--were still other mountains. Intervening on all sides was the stretching, soundless, aching void of desolation, carrying to the rider its lurking threat of death, the promise of evil to come. The man, however, seemed unperturbed. In his narrowed, squinting eyes as he watched the desert was a gleam of comprehension, of knowledge intimate and sympathetic. They glowed with the serene calm of confidence; and far back in them lurked a glint of grim mockery. It was as though they visualized the threatened dangers upon which they looked, answering the threat with contempt. The man was tall. His slim waist was girded by a cartridge belt which was studded with leaden missiles for the rifle that reposed in the saddle holster, and for the two heavy pistols that sagged at his hips. A gray woolen shirt adorned his broad shoulders; a scarlet neckerchief at his throat which had covered his mouth as he rode was now drooping on his chest; and the big, wide-brimmed felt hat he wore was jammed far down over his forehead. The well-worn leather chaps that covered his legs could not conceal their sinewy strength, nor could the gauntleted leather gloves on his hands hide the capable size of them.