"Shore, lady, Yaqui's goin' home," replied Ladd, gently. "An' considerin' our troubles I reckon we ought to thank God he knows the way." They mounted and rode down the slope toward the darkening south. Not until night travel was obstructed by a wall of cactus did the Indian halt to make a dry camp. Water and grass for the horses and fire to cook by were not to be had. Mercedes bore up surprisingly; but she fell asleep almost the instant her thirst had been allayed. Thorne laid her upon a blanket and covered her. The men ate and drank. Diablo was the only horse that showed impatience; but he was angry, and not in distress. Blanco Sol licked Gale's hand and stood patiently. Many a time had he taken his rest at night without a drink. Yaqui again bade the men sleep. Ladd said he would take the early watch; but from the way the Indian shook his head and settled himself against a stone, it appeared if Ladd remained awake he would have company. Gale lay down weary of limb and eye. He heard the soft thump of hoofs, the sough of wind in the cactus--then no more. When he awoke there was bustle and stir about him. Day had not yet dawned, and the air was freezing cold. Yaqui had found a scant bundle of greasewood which served to warm them and to cook breakfast. Mercedes was not aroused till the last moment. Day dawned with the fugitives in the saddle. A picketed wall of cactus hedged them in, yet the Yaqui made a tortuous path, that, zigzag as it might, in the main always headed south. It was wonderful how he slipped Diablo through the narrow aisles of thorns, saving the horse and saving himself. The others were torn and clutched and held and stung. The way was a flat, sandy pass between low mountain ranges. There were open spots and aisles and squares of sand; and hedging rows of prickly pear and the huge spider-legged ocatillo and hummocky masses of clustered bisnagi. The day grew dry and hot. A fragrant wind blew through the pass. Cactus flowers bloomed, red and yellow and magenta. The sweet, pale Ajo lily gleamed in shady corners. Ten miles of travel covered the length of the pass. It opened wide upon a wonderful scene, an arboreal desert, dominated by its pure light green, yet lined by many merging colors. And it rose slowly to a low dim and dark-red zone of lava, spurred, peaked, domed by volcano cones, a wild and ragged region, illimitable as the horizon. The Yaqui, if not at fault, was yet uncertain. His falcon eyes searched and roved, and became fixed at length at the southwest, and toward this he turned his horse. The great, fluted saguaros, fifty, sixty feet high, raised columnal forms, and their branching limbs and curving lines added a grace to the desert. It was the low-bushed cactus that made the toil and pain of travel. Yet these thorny forms were beautiful.