and across the river was a multitude of splendid buildings, richly coloured and glittering with metallic tracery and facets, among a forest of moss-like and lichenous trees. And suddenly something flapped repeatedly across the vision, like the fluttering of a jewelled fan or the beating of a wing, and a face, or rather the upper part of a face with very large eyes, came as it were close to his own and as if on the other side of the crystal. Mr. Cave was so startled and so impressed by the absolute reality of these eyes, that he drew his head back from the crystal to look behind it. He had become so absorbed in watching that he was quite surprised to find himself in the cool darkness of his little shop, with its familiar odour of methyl, mustiness, and decay. And, as he blinked about him, the glowing crystal faded, and went out. Such were the first general impressions of Mr. Cave. The story is curiously direct and circumstantial. From the outset, when the valley first flashed momentarily on his senses, his imagination was strangely affected, and, as he began to appreciate the details of the scene he saw, his wonder rose to the point of a passion. He went about his business listless and distraught, thinking only of the time when he should be able to return to his watching. And then a few weeks after his first sight of the valley came the two customers, the stress and excitement of their offer, and the narrow escape of the crystal from sale, as I have already told. Now, while the thing was Mr. Cave's secret, it remained a mere wonder, a thing to creep to covertly and peep at, as a child might peep upon a forbidden garden. But Mr. Wace has, for a young scientific investigator, a particularly lucid and consecutive habit of mind. Directly the crystal and its story came to him, and he had satisfied himself, by seeing the phosphorescence with his own eyes, that there really was a certain evidence for Mr. Cave's statements, he proceeded to develop the matter systematically. Mr. Cave was only too eager to come and feast his eyes on this wonderland he saw, and he came every night from half-past eight until half-past ten, and sometimes, in Mr. Wace's absence, during the day. On Sunday afternoons, also, he came. From the outset Mr. Wace made copious notes, and it was due to his scientific method that the relation between the direction from which the initiating ray entered the crystal and the orientation of the picture were proved. And, by covering the crystal in a box perforated only with a small aperture to admit the exciting ray, and by substituting black holland for his buff blinds, he greatly improved the conditions of the observations; so that in a little while they were able to survey the valley in any direction they desired.