"Shore they'll be comin' along," replied Ladd.

They built a fire, cooked and ate. The Yaqui spoke only one word: "Sleep." Blankets were spread. Mercedes dropped into a deep slumber, her head on Thorne's shoulder. Excitement kept Throne awake. The two rangers dozed beside the fire. Gale shared the Yaqui's watch. The sun began to climb and the icy edge of dawn to wear away. Rabbits bobbed their cotton tails under the mesquite. Gale climbed a rocky wall above the arroyo bank, and there, with command over the miles of the back-trail, he watched.

It was a sweeping, rolling, wrinkled, and streaked range of desert that he saw, ruddy in the morning sunlight, with patches of cactus and mesquite rough-etched in shimmering gloom. No Name Mountains split the eastern sky, towering high, gloomy, grand, with purple veils upon their slopes. They were forty miles away and looked five. Gale thought of the girl who was there under their shadow.

Yaqui kept the horses bunched, and he led them from one little park of galleta grass to another. At the end of three hours he took them to water. Upon his return Gale clambered down from his outlook, the rangers grew active. Mercedes was awakened; and soon the party faced westward, their long shadows moving before them. Yaqui led with Blanco Diablo in a long, easy lope. The arroyo washed itself out into flat desert, and the greens began to shade into gray, and then the gray into red. Only sparse cactus and weathered ledges dotted the great low roll of a rising escarpment.

Yaqui suited the gait of his horse to the lay of the land, and his followers accepted his pace. There were canter and trot, and swift walk and slow climb, and long swing--miles up and down and forward. The sun soared hot. The heated air lifted, and incoming currents from the west swept low and hard over the barren earth. In the distance, all around the horizon, accumulations of dust seemed like ranging, mushrooming yellow clouds.

Yaqui was the only one of the fugitives who never looked back. Mercedes did it the most. Gale felt what compelled her, he could not resist it himself. But it was a vain search. For a thousand puffs of white and yellow dust rose from that backward sweep of desert, and any one of them might have been blown from under horses' hoofs. Gale had a conviction that when Yaqui gazed back toward the well and the shining plain beyond, there would be reason for it. But when the sun lost its heat and the wind died down Yaqui took long and careful surveys westward from the high points on the trail. Sunset was not far off, and there in a bare, spotted valley lay Coyote Tanks, the only waterhole between Papago Well and the Sonoyta Oasis. Gale used his glass, told Yaqui there was no smoke, no sign of life; still the Indian fixed his falcon eyes on distant spots looked long. It was as if his vision could not detect what reason or cunning or intuition, perhaps an instinct, told him was there. Presently in a sheltered spot, where blown sand had not obliterated the trail, Yaqui found the tracks of horses. The curve of the iron shoes pointed westward. An intersecting trail from the north came in here. Gale thought the tracks either one or two days old. Ladd said they were one day. The Indian shook his head.

No farther advance was undertaken. The Yaqui headed south and traveled slowly, climbing to the brow of a bold height of weathered mesa. There he sat his horse and waited. No one questioned him. The rangers dismounted to stretch their legs, and Mercedes was lifted to a rock, where she rested. Thorne had gradually yielded to the desert's influence for silence. He spoke once or twice to Gale, and occasionally whispered to Mercedes. Gale fancied his friend would soon learn that necessary speech in desert travel meant a few greetings, a few words to make real the fact of human companionship, a few short, terse terms for the business of day or night, and perhaps a stern order or a soft call to a horse.

The sun went down, and the golden, rosy veils turned to blue and shaded darker till twilight was there in the valley. Only the spurs of mountains, spiring the near and far horizon, retained their clear outline. Darkness approached, and the clear peaks faded. The horses stamped to be on the move.