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284 evolve. He had some half-formed conception of their superstitious fears and of their especial dread of night, and so he decided to wait until darkness fell and the blacks partially worked to hysteria by their dancing and religious rites before he took any steps toward the freeing of Numa. In the meantime, he hoped, an idea adequate to the possibilities of the various factors at hand would occur to him. Nor was it long before one did.

He had swung off through the jungle to search for food when the plan came to him. At first it made him smile a little and then look dubious, for he still retained a vivid memory of the dire results that had followed the carrying out of a very wonderful idea along almost identical lines, yet he did not abandon his intention, and a moment later, food temporarily forgotten, he was swinging through the middle terraces in rapid flight toward the stamping ground of the tribe of Kerchak, the great ape.

As was his wont, he alighted in the midst of the little band without announcing his approach save by a hideous scream just as he sprang from a branch above them. Fortunate are the apes of Kerchak that their kind is not subject to heart failure, for the methods of Tarzan subjected them to one severe shock after another, nor could they ever accustom themselves to the ape-man's peculiar style of humor. Now, when they saw who it was they merely snarled and grumbled angrily for a moment and