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.