He just pointed out a cliff-dwelling to me. See it? . . . There ‘way up in that cave of the wall.”

Shefford saw a steep, rough slope leading up to a bulge of the cliff, and finally he made out strange little houses with dark, eyelike windows. He wanted to climb up there. Withers called his attention to more caves with what he believed were the ruins of cliff-dwellings. And as they rode along the trader showed him remarkable formations of rock where the elements were slowly hollowing out a bridge. They came presently to a region of intersecting canyon, and here the breaking of the trail up and down the deep washes took Withers back to his task with the burros and gave Shefford more concern than he liked with Nack- yal. The mustang grew unruly and was continually turning to the left. Sometimes he tried to climb the steep slope. He had to be pulled hard away from the opening canyon on the left. It seemed strange to Shefford that the mustang never swerved to the right. This habit of Nack-yal’s and the increasing caution needed on the trail took all of Shefford’s attention. When he dismounted, however, he had a chance to look around, and more and more he was amazed at the increasing proportions and wildness of the Sagi.

He came at length to a place where a fallen tree blocked the trail. All of the rest of the pack-train had jumped the log. But Nack-yal balked. Shefford dismounted, pulled the bridle over the mustang’s head, and tried to lead him. Nack-yal, however, refused to budge. Whereupon Shefford got a stick and, remounting, he gave the balky mustang a cut across the flank. Then something violent happened. Shefford received a sudden propelling jolt, and then he was rising into the air, and then falling. Before he alighted he had a clear image of Nack-yal in the air above him, bent double, and seemingly possessed of devils. Then Shefford hit the ground with no light thud. He was thoroughly angry when he got dizzily upon his feet, but he was not quick enough to catch the mustang. Nack-yal leaped easily over the log and went on ahead, dragging his bridle. Shefford hurried after him, and the faster he went just by so much the cunning Nack-yal accelerated his gait. As the pack-train was out of sight somewhere ahead, Shefford could not call to his companions to halt his mount, so he gave up trying, and walked on now with free and growing appreciation of his surroundings.

The afternoon had waned. The sun blazed low in the west in a notch of the canyon ramparts, and one wall was darkening into purple shadow while the other shone through a golden haze. It was a weird, wild world to Shefford, and every few strides he caught his breath and tried to realize actuality was not a dream.

Nack-yal kept about a hundred paces to the fore and ever and anon he looked back to see how his new master was progressing. He varied these occasions by reaching down and nipping a tuft of grass. Evidently he was too intelligent to go on fast enough to be caught by Withers. Also he kept continually looking up the slope to the left as if seeking a way to climb out of the valley in that direction. Shefford thought it was well the trail lay at the foot of a steep slope that ran up to unbroken bluffs.

The sun set and the canyon lost its red and its gold and deepened its purple. Shefford calculated he had walked five miles, and though he did not mind the effort, he would rather have ridden Nack-yal into camp. He mounted a cedar ridge, crossed some sandy washes, turned a corner of bold wall to enter a wide, green level.