But as he pursued ever farther the elusive vegetation in the joy of freedom, he presently awoke to his great distance from camp, and, indeed, from the other horses. Conscious of a sudden gripping loneliness and a certain apprehension, he began to retrace his way. As he did so, out of the silence came a nasty whirring sound, and suddenly he felt a rope settle over his head. Surprise, then anger, displaced his loneliness and apprehension; he jerked back to escape the rope. But it held fast. He braced his legs and began to pull steadily. But the harder he pulled the worse the rope choked him. Finally he ceased all effort and turned his eyes along the rope. At the far end stood the little mare, legs braced in the sand, and astride her, stolid and grim, and with eyes narrowed, the figure of the large man. At sight of him Pat began to pull again, more through ugliness now than desire to escape, until he found that he was dragging the little gray out of her stiffened hold. Then he slackened off. Also, as she wheeled back toward camp, he set out amiably after her. In camp he found his young friend scattering and deadening the coals of the camp-fire, and the little man making up the saddle-bags. This told him that the journey was to be resumed, and he stood quiet and peaceful as he was being bridled and saddled, and afterward he trotted along under the guidance of his master without show of anger or rebellion. Indeed, though the sun was hot, and the unmarked trail tedious, and the weight on his back heavier than ever, he felt less fretful and more contented than at any time since leaving the little ranch beside the river--possibly because of the thrill of his double encounter. Ahead and on either hand the desert soon began to break and lift. As they went on the dunes grew to be hills and heights, growing, looming, closing in upon them. Now and again a clump of trees or a shoulder of rock or a stretch of foliage stepped out in relief against the brown of the landscape, revealing more than once ideal grazing-land. Also, as they penetrated deeper into this broken country, the sky overhead showed change. From a spotless blue it revealed tiny splotches of gray-white cloud scudding before upper currents. With the passing hours these clouds became heavy, sullen, and threatening, until the sun, dipping into the west, sinking in a kind of hazy moisture, left the heavens completely overcast, cold and bleak and forbidding--a dense mass of cloud-banks down to the tip of ridge and range. And now came dusk, short and chill, and with it the slow ascent of a long grade, leading them up to a ridge, low and ragged, trailing away interminably to north and south in the gloom. Complete darkness found them deep among high hills.