text:  There was a valley and a ridge of rock before them and they had to clamber first down the rugged precipice they were upon then to cross the valley and then to struggle up the opposite side a trembling motion growing perceptible as they advanced before they stood on a sort of broad ledge which they perceived at the angles that jutted out went down straight into a depth and opposite which was another broad table-land of rock between which and that they were upon was a rent wider and narrower in various parts and running along as far as they could see to right and left