Shefford took exception to Nack-yal’s manner and to his reluctance to go, and especially to a habit the mustang had of turning off the trail to the left. Shefford had managed some rather spirited horses back in Illinois; and though he was willing and eager to learn all over again, he did not enjoy the prospect of Lake and Withers seeing this black mustang make a novice of him. And he guessed that was just what Nack-yal intended to do. However, once up over the hill, with Kayenta out of sight, Nack-yal trotted along fairly well, needing only now and then to be pulled back from his strange swinging to the left off the trail.

The pack-train traveled steadily and soon crossed the upland plain to descend into the valley again. Shefford saw the jagged red peaks with an emotion he could not name. The canyon between them were purple in the shadows, the great walls and slopes brightened to red, and the tips were gold in the sun. Shefford forgot all about his mustang and the trail.

Suddenly with a pound of hoofs Nack-yal seemed to rise. He leaped sidewise out of the trail, came down stiff-legged. Then Shefford shot out of the saddle. He landed so hard that he was stunned for an instant. Sitting up, he saw the mustang bent down, eyes and ears showing fight, and his forefeet spread. He appeared to be looking at something in the trail. Shefford got up and soon saw what had been the trouble. A long, crooked stick, rather thick and black and yellow, lay in the trail, and any mustang looking for an excuse to jump might have mistaken it for a rattlesnake. Nack-yal appeared disposed to be satisfied, and gave Shefford no trouble in mounting. The incident increased Shefford’s dubiousness. These Arizona mustangs were unknown quantities.

Thereafter Shefford had an eye for the trail rather than the scenery, and this continued till the pack-train entered the mouth of the Sagi. Then those wonderful lofty cliffs, with their peaks and towers and spires, loomed so close and so beautiful that he did not care if Nack- yal did throw him. Along here, however, the mustang behaved well, and presently Shefford decided that if it had been otherwise he would have walked. The trail suddenly stood on end and led down into the deep wash, where some days before he had seen the stream of reddish water. This day there appeared to be less water and it was not so red. Nack- yal sank deep as he took short and careful steps down. The burros and other mustangs were drinking, and Nack-yal followed suit. The Indian, with a hand clutching his mustang’s mane, rode up a steep, sandy slope on the other side that Shefford would not have believed any horse could climb. The burros plodded up and over the rim, with Withers calling to them. Joe Lake swung his rope and cracked the flanks of the gray mare and the red mule; and the way the two kicked was a revelation and a warning to Shefford. When his turn came to climb the trail he got off and walked, an action that Nack-yal appeared fully to appreciate.

From the head of this wash the trail wound away up the widening canyon, through greasewood flats and over greasy levels and across sandy stretches. The looming walls made the valley look narrow, yet it must have been half a mile wide. The slopes under the cliffs were dotted with huge stones and cedar-trees. There were deep indentations in the walls, running back to form box canyon, choked with green of cedar and spruce and pinyon. These notches haunted Shefford, and he was ever on the lookout for more of them.

Withers came back to ride just in advance and began to talk.

“Reckon this Sagi canyon is your Deception Pass,” he said. “It’s sure a queer hole. I’ve been lost more than once, hunting mustangs in here. I’ve an idea Nas Ta Bega knows all this country.