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 it was worse, for another gryf had joined the first and now two waited beneath the tree in which they stopped.

The cliff looming high above them with its innumerable cave mouths seemed to beckon and to taunt them. It was so near, yet eternity yawned between. The body of the Tor-o-don lay at the cliff's foot where it had fallen. It was in plain view of the two in the tree. One of the gryfs walked over and sniffed about it, but did not offer to devour it. Tarzan had examined it casually as he had passed earlier in the morning. He guessed that it represented either a very high order of ape or a very low order of man—something akin to the Java man, perhaps; a truer example of the pithecanthropi than either the Ho-don or the Waz-don; possibly the precursor of them both. As his eyes wandered idly over the scene below his active brain was working out the details of the plan that he had made to permit Pan-at-lee's escape from the gorge. His thoughts were interrupted by a strange cry from above them in the gorge.

"Whee-oo! Whee-oo!" it sounded, coming closer.

The gryfs below raised their heads and looked in the direction of the interruption. One of them made a low, rumbling sound in its throat. It was not a bellow and it did not indicate anger. Immediately the "Whee-oo!" responded. The gryfs repeated the rumbling and at intervals the