From the darkness, and the cautious rate at which he had to proceed, holding back the dog who tugged hard at the whip, Richard could not even hazard a conjecture as to the distance they had advanced, when he heard the noise of a small runnel of water, which seemed from the sound to make abrupt descent from some little height. He had gone but a few paces further when the handle of the whip received a great upward pull and was left loose in his grasp: the dog was away, leaving his handkerchief at the end of the thong. So now he had to guide himself, and began to feel about him. He seemed at first to have come to the end of the passage, for he could touch both sides of it by stretching out his arms, and in front a tiny stream of water came down the face of the rough rock; but what then had become of Marquis? The answer seemed plain: the water must come from somewhere, and doubtless its channel had spare room enough for the dog to pass thither. He felt up the rock, and found that, at about the height of his head, the water came over an obtuse angle. Climbing a foot or two, he discovered that the opening whence it issued was large enough for him to enter. Only one who has at some time passed where lengthened creeping was necessary, will know how Richard felt, with water under him, pitch-darkness about him, and the rock within an inch or two of his body all round. By and by the slope became steeper and the ascent more difficult. The air grew very close, and he began to fear he should be stifled. Then came a hot breath, and a pair of eyes gleamed a foot or two from his face. Had he then followed into the den of the animal by which poor Marquis had been so frightfully torn? But no: it was Marquis himself waiting for him! 'Go on, Marquis,' he said, with a sigh of relief. The dog obeyed, and in another moment a waft of cool air came in. Presently a glimmer of light appeared. The opening through which it entered was a little higher than his horizontally posed head, and looked alarmingly narrow. But as he crept nearer it grew wider, and when he came under it he found it large enough to let him through. When cautiously he poked up his head, there was the huge mass of the keep towering blank above him! On a level with his eyes, the broad, lilied waters of the moat lay betwixt him and the citadel.