ave traveled a considerable distance at
right angles to its original course before it crashed to earth. If
its occupants were killed or badly injured the ape-man might search
futilely in their immediate vicinity for some time before finding
them.

There was but one thing to do and that was to travel to a point
as close as possible to where he judged the plane had landed, and
then to follow in ever-widening circles until he picked up their
scent spoor. And this he did.

Before he left the valley of plenty he made several kills and
carried the choicest cuts of meat with him, leaving all the dead
weight of bones behind. The dense vegetation of the jungle terminated
at the foot of the western slope, growing less and less abundant
as he neared the summit beyond which was a sparse growth of sickly
scrub and sunburned grasses, with here and there a gnarled and hardy
tree that had withstood the vicissitudes of an almost waterless
existence.

From the summit of the hills Tarzan's keen eyes searched the arid
landscape before him. In the distance he discerned the ragged
tortuous lines that marked the winding course of the hideous gorges
which scored the broad plain at intervals--the terrible gorges that
had so nearly claimed his life in punishment for his temerity in
attempting to invade the sanctity of their ancient solitude.

For two days Tarzan sought futilely for some clew to the whereabouts
of the machine or its occupants. He cached portions of his kills at
different points, building cairns of rock to mark their locations.
He crossed the first deep gorge and circled far beyond it. Occasionally
he stopped and called aloud, listening for some response but
only silence rewarded him-a sinister silence that his cries only
accentuated.

Late in the evening of the second day he came to the well-remembered
gorge in which lay the clean-picked bones of the ancient adventurer,
and here, for the first time, Ska, the vulture, picked up his trail.
"Not this time, Ska," cried the ape-man in a taunting voice, "for
now indeed is Tarzan Tarzan. Before, you stalked the grim skeleton
of a Tarmangani and even then you lost. Waste not your time upon
Tarzan of the Apes in the full of his strength." But still Ska, the
vulture, circled and soared above him, and the ape-man, notwithstanding
his boasts, felt a shudder of apprehension. Through his brain ran
a persistent and doleful chant to which he involuntarily set two
words, repeated over a