They passed the first of the shelf-like brinks, traversed a safer contour of the wall, and were presently isolated upon the second bridge of granite, which was also the last, much longer than the first, but perhaps not so narrow or winding. Van had perspired in nervous tension, as the two women rode above the chasm. Men had gone down here to oblivion. He was easier now, more careless of himself and horse, less alert for a looseness in the granite mass, as he turned in his saddle to look backward. Suddenly, with a horrible sensation in his vitals, he felt his pony crumpling beneath him, even as he heard Beth sound a cry. A second later he was going, helplessly, with the air-rush in his ears and the pony's quiver shivering up his spine. All bottomless space seemed to open where they dropped. He kicked loose the stirrups, even as the pony struck upon the first narrow terrace, ten feet down, and felt the helpless animal turned hoofs and belly upward by the blow. He had thrust himself free--apart from the horse--but could not cling to the rotten ledge for more than half a second. Then down once more he was falling, as before, only a heart-beat later than the pinto. Out of the lip of the next shelf below the pony's weight tore a jagged fragment. The animal's neck was broken, and he and the stone-mass plunged on downward together. Van half way fell through a stubborn bush--that clung with the mysterious persistency of life to a handful of soil in a crevice--and his strong hands closed upon its branches. He was halted with a jolt. The pony hurtled loosely, grotesquely down the abyss, bounding from impacts with the terraces, and was presently lost to mortal sight in the dust and debris he carried below for a shroud. Sounds of his striking--dull, leaden sounds, tremendous in the all-pervading silence--came clearly up to the top. Then Van found his feet could be rested on the shelf, and he let himself relax to ease his arms. CHAPTER III A RESCUE Beth had uttered that one cry only, as man and horse careened above the pit. She now sat dumbly staring where the two had disappeared. Nothing could she see of Van or his pony. A chill of horror attacked her, there in the blaze of the sun. It was not, even then, so much of herself and Elsa she was thinking--two helpless women, lost in this place of terrible silence; she was smitten by the fate of their guide. Van, for his part, looked about as best he might, observing his situation comprehensively. He was safe for the moment. The ledge whereon he was bearing a portion of his weight was narrow and crumbling with old disintegration. The shrub to which he clung was as tough as wire cable, and had once been stoutly rooted in the crevice. Now, however, its hold had been weakened by the heavy strain upon it, and yet he must continue to trust a part of his weight to its branches. There was nothing, positively nothing, by which he could hope to climb to the trail up above.