THE RETURN OF TARZAN
Again he returned, only to move a few feet to the other side.
Once more he made the entire circuit of the room, feeling carefully every foot of the walls. Finally he stopped again before the particular section that had aroused his curiosity. There was no doubt of it! A distinct draft of fresh air was blowing into the chamber through the intersection of the masonry at that particular point—and nowhere else.
Tarzan tested several pieces of the granite which made up the wall at this spot, and finally was rewarded by finding one which lifted out readily. It was about ten inches wide, with a face some three by six inches showing within the chamber. One by one the ape-man lifted out similarly shaped stones. The wall at this point was constructed entirely, it seemed, of these almost perfect slabs. In a short time he had removed some dozen, when he reached in to test the next layer of masonry. To his surprise, he felt nothing behind the masonry he had removed as far as his long arm could reach.
It was a matter of but a few minutes to remove enough of the wall to permit his body to pass through the aperture. Directly ahead of him he thought he discerned a faint glow—scarcely more than a less impenetrable darkness. Cautiously he moved forward on hands and knees, until at about fifteen feet, or the average thickness of the foundation walls, the floor ended abruptly in a sudden drop. As far out as he could reach he felt nothing, nor could he find the
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