Slone hurried onward, to be blocked by a huge crack in the rocky plateau. This he had to head. And then another and like obstacle checked his haste to reach that promontory. He was forced to go more slowly. Wildfire had been close only as to sight. And this was the great canyon that dwarfed distance and magnified proximity. Climbing down and up, toiling on, he at last learned patience. He had seen Wildfire at close range. That was enough. So he plodded on, once more returning to careful regard of Nagger. It took an hour of work to reach the point where Wildfire had disappeared.

A promontory indeed it was, overhanging a valley a thousand feet below. A white torrent of a stream wound through it. There were lines of green cottonwoods following the winding course. Then Slone saw Wildfire slowly crossing the flat toward the stream. He had gone down that cliff, which to Slone looked perpendicular.

Wildfire appeared to be walking lame. Slone, making sure of this, suffered a pang. Then, when the significance of such lameness dawned upon him he whooped his wild joy and waved his hat. The red stallion must have heard, for he looked up. Then he went on again and waded into the stream, where he drank long. When he started to cross, the swift current drove him back in several places. The water wreathed white around him. But evidently it was not deep, and finally he crossed. From the other side he looked up again at Nagger and Slone, and, going on, he soon was out of sight in the cottonwoods.

"How to get down!" muttered Slone.

There was a break in the cliff wall, a bare stone slant where horses had gone down and come up. That was enough for Slone to know. He would have attempted the descent if he were sure no other horse but Wildfire had ever gone down there. But Slone's hair began to rise stiff on his head. A horse like Wildfire, and mountain sheep and Indian ponies, were all very different from Nagger. The chances were against Nagger.

"Come on, old boy. If I can do it, you can," he said.

Slone had never seen a trail as perilous as this. He was afraid for his horse. A slip there meant death. The way Nagger trembled in every muscle showed his feelings. But he never flinched. He would follow Slone anywhere, providing Slone rode him or led him. And here, as riding was impossible, Slone went before. If the horse slipped there would be a double tragedy, for Nagger would knock his master off the cliff. Slone set his teeth and stepped down. He did not let Nagger see his fear. He was taking the greatest risk he had ever run.

The break in the wall led to a ledge, and the ledge dropped from step to step, and these had bare, slippery slants between. Nagger was splendid on a bad trail. He had methods peculiar to his huge build and great weight. He crashed down over the stone steps, both front hoofs at once. The slants he slid down on his haunches with his forelegs stiff and the iron shoes scraping. He snorted and heaved and grew wet with sweat. He tossed his head at some of the places. But he never hesitated and it was impossible for him to go slowly. Whenever Slone came to corrugated stretches in the trail he felt grateful. But these were few. The rock was like smooth red iron. Slone had never seen such hard rock. It took him long to realize that it was marble. His heart seemed a tense, painful knot in his breast, as if it could not beat, holding back in the strained suspense. But Nagger never jerked on the bridle. He never faltered. Many times he slipped, often with both front feet, but never with all four feet. So he did not fall. And the red wall began to loom above Slone. Then suddenly he seemed brought to a point where it was impossible to descend. It was a round bulge, slanting fearfully, with only a few little rough surfaces to hold a foot. Wildfire had left a broad, clear-swept mark at that place, and red hairs on some of the sharp points. He had slid down. Below was an offset that fortunately prevented further sliding, Slone started to walk down this place, but when Nagger began to slide Slone had to let go the bridle and jump. Both he and the horse landed safely. Luck was with them. And they went on, down and down, to reach the base of the great wall, scraped and exhausted, wet with sweat, but unhurt. As Slone gazed upward he felt the impossibility of believing what he knew to be true. He hugged and petted the horse. Then he led on to the roaring stream.

It was green water white with foam. Slone waded in and found the water cool and shallow and very swift. He had to hold to Nagger to keep from being swept downstream. They crossed in safety. There in the sand showed Wildfire's tracks. And here were signs of another Indian camp, half a year old.

The shade of the cottonwoods was pleasant. Slone found this valley oppressively hot. There was no wind and the sand blistered his feet through his boots. Wildfire held to the Indian trail that had guided him down into this wilderness of worn rock. And that trail crossed the stream at every turn of the twisting, narrow valley. Slone enjoyed getting into the water. He hung his gun over the pommel and let the water roll him. A dozen times he and Nagger forded the rushing torrent. Then they came to a box-like closing of the valley to canyon walls, and here the trail evidently followed the stream bed. There was no other way. Slone waded in, and stumbled, rolled, and floated ahead of the sturdy horse. Nagger was wet to his breast, but he did not fall. This gulch seemed full of a hollow rushing roar. It opened out into a wide valley. And Wildfire's tracks took to the left side and began to climb the slope.