before he paused, and there finding a secure foothold, he stopped
and looked down upon Numa who was leaping upward in a wild and
futile attempt to scale the rocky wall to his prey. Fifteen or
twenty feet from the ground the lion would scramble only to fall
backward again defeated. Tarzan eyed him for a moment and then
commenced a slow and cautious ascent toward the summit. Several
times he had difficulty in finding holds but at last he drew himself
over the edge, rose, picked up a bit of loose rock, hurled it at
Numa and strode away.

Finding an easy descent to the gorge, he was about to pursue his
journey in the direction of the still-booming guns when a sudden
thought caused him to halt and a half-smile to play about his lips.
Turning, he trotted quickly back to the outer opening of Numa's
tunnel. Close beside it he listened for a moment and then rapidly
began to gather large rocks and pile them within the entrance.
He had almost closed the aperture when the lion appeared upon the
inside--a very ferocious and angry lion that pawed and clawed at
the rocks and uttered mighty roars that caused the earth to tremble;
but roars did not frighten Tarzan of the Apes. At Kala's shaggy
breast he had closed his infant eyes in sleep upon countless nights
in years gone by to the savage chorus of similar roars. Scarcely a
day or night of his jungle life--and practically all his life had
been spent in the jungle--had he not heard the roaring of hungry
lions, or angry lions, or love-sick lions. Such sounds affected
Tarzan as the tooting of an automobile horn may affect you--if you
are in front of the automobile it warns you out of the way, if you
are not in front of it you scarcely notice it. Figuratively Tarzan
was not in front of the automobile--Numa could not reach him and
Tarzan knew it, so he continued deliberately to choke the entrance