The path now contracted between sable and glistening walls, and began to display an even greater steepness than before. It was a bad footing, and the yak often slipped on the stony fragments strewn thickly about. In two hours Carter saw ahead a definite crest, beyond which was nothing but dull grey sky, and blessed the prospect of a level or downward course. To reach this crest, however, was no easy task; for the way had grown nearly perpendicular, and was perilous with loose black gravel and small stones. Eventually Carter dismounted and led his dubious yak; pulling very hard when the animal balked or stumbled, and keeping his own footing as best he might. Then suddenly he came to the top and saw beyond, and gasped at what he saw.