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166 which Bukawai had set up, listening to the snarls and growls which came faintly from the far recesses of the cavern.

Presently, mingled with the beastly cries, there came faintly to the keen ears of the ape-man, the agonized moan of a child. No longer did Tarzan hesitate. Hurling the door aside, he sprang into the dark opening. Narrow and black was the corridor; but long use of his eyes in the Stygian blackness of the jungle nights had given to the ape-man something of the noctural visionary powers of the wild things with which he had consorted since babyhood.

He moved rapidly and yet with caution, for the place was dark, unfamiliar and winding. As he advanced, he heard more and more loudly the savage snarls of the two hyenas, mingled with the scraping and scratching of their paws upon wood. The moans of a child grew in volume, and Tarzan recognized in them the voice of the little black boy he once had sought to adopt as his balu.

There was no hysteria in the ape-man's advance. Too accustomed was he to the passing of life in the jungle to be greatly wrought even by the death of one whom he knew; but the lust for battle spurred him on. He was only a wild beast at heart and his wild beast's heart beat high in anticipation of conflict.

In the rocky chamber of the hill's center, little