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 As the slave bent over some dish which stood upon the table his ear was not far from the aperture through which Tarzan looked. Apparently from a solid wall, for the Negro had no knowledge of the existence of the niche, came to him in the tongue of his own people, the whispered words: "If you would return to the land of the Wamabo say nothing, but do as I bid you."

The black rolled terrified eyes toward the hangings at his side. The ape-man could see him tremble and for a moment was fearful that in his terror he would betray them. "Fear not," he whispered, "we are your friends."

At last the Negro spoke in a low whisper, scarcely audible even to the keen ears of the ape-man. "What," he asked, "can poor Otobu do for the god who speaks to him out of the solid wall?"

"This," replied Tarzan. "Two of us are coming into this room. Help us prevent this man and woman from escaping or raising an outcry that will bring others to their aid."

"I will help you," replied the Negro, "to keep them within this room, but do not fear that their outcries will bring others. These walls are built so that no sound may pass through and even if it did what difference would it make in this village which is constantly filled with the screams of its mad people. Do not fear their cries. No one will notice them. I go to do your bidding."

Tarzan saw the black cross the room to the table upon which he placed another dish of food before