Back they came to her room, to stand before a window which gave onto a shadowed little clearing in the rear of the cabin. "Look!" whispered Ellen. There was a single mound of earth, with a white cross set over it, on which was the single word: Mangor. It might have been a word in some native dialect. It might have been some native's name. It might have been anything, but, whatever it was, it added to the sinister atmosphere which seemed to hang like an evil mist over the home of Caleb Barter. "That settles it, Ellen," he said. "You'll spend the night in my room." Ellen retired in Bentley's room, closing the door which led to the adjoining room, and Bentley walked back and forth in the reception room, waiting for Barter to return. When darkness fell he lighted the lamps he had previously located. Their odor caused him to guess that the fuel they used was some sort of animal fat. In the strange glow from the lamps, his shadow on the walls, as he walked to and fro, was grotesque, terrible--and at times a grim reminder of the great apes. It caused him to consider how, after all, human beings were akin to gorillas and chimpanzees. Somehow, now, it was a horrible thought. * * * * * The night wore on and Bentley's stride became faster. Now and again he peered into the girl's room. She was sleeping the sleep of utter exhaustion and he did not waken her. Bentley felt it was near midnight when Barter returned, his return heralded by a strange commotion in the clearing, and the frightful drumming of the great apes--or at least _one_ great ape. Bentley shuddered as the animal behind the locked door answered the drumming challenge with a drumming thunder of his own. Barter came in, and Bentley accosted him at once. "See here, Barter," he began. "I don't like it here. There's something strange going on in this clearing. Miss Estabrook and I wish to leave immediately in the morning! And that grave behind the cabin, who or what is it?" Barter studied the almost trembling Bentley for all of a minute. "That grave?" he said at last, with silken softness. "It's the grave of a jungle savage. He died in the interest of science. As for you, you'll leave here when I bid you, and not before, understand? I've a guardian outside that would tear both of you limb from limb." But Bentley caught and held fast to certain words the scientist had spoken. "The savage died in the interest of science?" he said. "What do you mean?" Barter smiled his red-lipped smile.