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 to his lips the hideous, bestial challenge of the bull-ape.

Rokoff shuddered as the weird and terrible alarm fell upon his ears. Cowering in the bottom of the boat, his teeth chattering in terror, he watched the man he feared above all other creatures upon the face of the earth as he ran quickly to the edge of the water.

Even though the Russian knew that he was safe from his enemy, the very sight of him threw him into a frenzy of trembling cowardice, which became frantic hysteria as he saw the white giant dive fearlessly into the forbidding waters of the tropical river.

With steady, powerful strokes the ape-man forged out into the stream toward the drifting dugout. Now Rokoff seized one of the paddles lying in the bottom of the craft, and, with terror-wide eyes still glued upon the living death that pursued him, struck out madly in an effort to augment the speed of the unwieldy canoe.

And from the opposite bank a sinister ripple, unseen by either man, moving steadily toward the half-naked swimmer.

Tarzan had reached the stern of the craft at last. One hand upstretched grasped the gunwale.