The crystal before them was some six feet square. It was gray and cloudy. Fahn pressed one of the small black buttons, and moved the lever over a notch; the crystal flooded with color. It was like looking through a huge window. "The viewpoint of our station a mile north of here," Fahn pointed out. "A thirty foot tower," Loto explained. "The lens on it swings in a circle. We are looking westward now toward Orleen." The scene in the crystal showed the red western sky; a white road in the foreground, disappearing seemingly at Rogers' feet; the green, palm-dotted island, with twilight shadows creeping upon it, and to the left, the island mountain range, its peaks rising in serrated ranks, with giant, snow-clad summits. "It was near here that day before yesterday they found the charred bodies of Toroh's brother and his Noth companion," Loto added. "A Bas woman--see that shack there by the road--she saw a girl and a man passing the night before. It may have been George and Dee." The shack at the roadside showed plainly. A Bas woman was sitting at its doorway, crooning to her infant. Her voice sounded almost as clearly as though the watchers had been sitting on the small tower where the lens and radio mechanism were perched. "We will turn," Fahn said. A panorama unfolding, the scene moved slowly sidewise: the sea to the north, with the mountain range beyond it, dim in the gathering darkness; east, back toward Anglese City, where the cavern-mountain itself showed behind the palms; to the south past a distant vista of city houses; and still swinging, it came back to the road and the house and stopped, again facing the west. "Another station," Fahn added. The crystal-face went dark, and then relighted. It was a viewpoint of a hundred feet in the air this time. Again it swung the points of the compass. For half an hour Fahn continued his demonstration. There might have been a hundred or more towers scattered over the island, and the scene from any one of them sprang at Fahn's will into the crystal window. "What are the other crystal mirrors for?" Rogers asked Loto. "The island can be searched by several operators simultaneously. Any viewpoint may be thrown into any crystal, and there are receivers for your ears, so that the sounds you hear will not confuse others in the room." The island was growing dark. The crystal showed a viewpoint from the channel coast halfway to Orleen. It must have been from a very high tower; the sea stretched several hundred feet beneath. "Those mountains across the water," Rogers remarked, "can't be over twenty or thirty miles from our shores. Is that where Toroh's army will gather?" "From behind them," said Loto. "To the east, nearer the Atlantic Coast, we think. We--" Fahn had given a slight cry. The room was dark, but the reflected light from the crystal showed the Scientist pointing into the mirrored scene. "Loto, what is that?"