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 apparently by means of pegs similar to those directly below him. He watched it intently as it rose higher and higher until he was able to distinguish its form more clearly, with the result that he became convinced that it more nearly resembled some form of great ape than a lower order. It had a tail, though, and in other respects it did not seem a true ape.

Slowly it ascended to the upper tier of caves, into one of which it disappeared. Then Tarzan took up again the trail of Pan-at-lee. He followed it down the stone pegs to the nearest cave and then further along the upper tier. The ape-man raised his eyebrows when he saw the direction in which it led, and quickened his pace. He had almost reached the third cave when the echoes of Kor-ul-gryf were awakened by a shrill scream of terror.