Arthur went to his room and presently appeared with the queer camera. It was a long box, and evidently the lens was one of great focal length. It took Arthur a long time to adjust it properly. He proposed to take advantage of the fact that the eye of a dead person will retain for from twenty-four to forty-eight hours the impression of what it saw last while living. A great many people think that the shining image on the outer surface of the eye retains that picture, and wonder at it. As a matter of fact the picture is kept on the retina, in the inside of the eyeball. It is extremely difficult to photograph the retina without dissecting the eye, but it can be done--as Arthur proceeded to prove. I went outside and searched around the house for possible footprints. After a preliminary search, I got Evan to help me. We could find no single sign of tracks leading toward or away from the house. There had been a heavy dew, and the top layer of the earth was dark and damp. Footprints would inevitably have been shown. When we had completed our search, we stared at each other. Whatever or whoever had killed the native girl must be still in the house. There were absolutely no signs of his having left. We went inside. Beast or man, _something_ had been in the house, moving quietly and undiscovered despite our watching. It had entered the room occupied by the native girl and had awakened her. She had seen it, and it had been a thing she recognized as frightful. Her horror-stricken face was proof of that. It had been cunning enough to latch the door of the room after the killing. That meant a native. On the other hand, it had broken the girl's neck, a feat that would require incredible strength. That spoke of a monstrous animal. We heard Arthur shuffling about in his improvised dark room, and the clink of the dishes in which he had mixed his solutions. How had the creature--man or beast--reached the house? How had it made its way silently through the rooms at midnight, with one of us awake and on guard? Could it be that one of the servants had remained, hidden in some secret place while the others had left, and now prowled about at night while the rest far off in the bush yelled and howled, drummed and danced, and gradually became ripe to attack us? Arthur came out of his dark room with a glass plate in his hand. His face was pale. "Look at this," he said quietly. "If you'll hold it so the light strikes it diagonally, you'll see it in its proper lights and shades, instead of reversed." The plate was still wet, where he had just taken it from the fixing bath. We looked. We saw, running aimlessly here and there, curiously like the branches of a tree, little dark lines. Those were the blood vessels that nourished the eye. We gave no heed to them, however. The sight that made both Evan and myself gasp was the strange picture that we saw amid all those little blood vessels.