And then Clayton saw an incredible thing. Tarzan, racking his brains for some means to cope single-handed with the infuriated beast, had suddenly recalled his battle with Terkoz; and as the great shoulders came clear of the window, so that the lioness hung upon the sill only by her forepaws, Tarzan suddenly released his hold upon the brute.

With the quickness of a striking rattler he launched himself full upon Sabor’s back, his strong young arms seeking and gaining a full-Nelson upon the beast, as he had learned it that other day during his bloody, wrestling victory over Terkoz.

With a roar the lioness turned completely over upon her back, falling full upon her enemy; but the black-haired giant only closed tighter his hold.

Pawing and tearing at earth and air, Sabor rolled and threw herself this way and that in an effort to dislodge this strange antagonist; but ever tighter and tighter drew the iron bands that were forcing her head lower and lower upon her tawny breast.

Higher crept the steel forearms of the ape-man about the back of Sabor’s neck. Weaker and weaker became the lioness’s efforts.

At last Clayton saw the immense muscles of Tarzan’s shoulders and biceps leap into corded knots beneath the silver moonlight. There was a long sustained and supreme effort on the ape-man’s part—and the vertebrae of Sabor’s neck parted with a sharp snap.

In an instant Tarzan was upon his feet, and for the second time that day Clayton heard the bull ape’s savage roar of victory. Then he heard Jane’s agonized cry:

“Cecil—Mr. Clayton! Oh, what is it? What is it?”

Running quickly to the cabin door, Clayton called out that all was right, and shouted to her to open the door. As quickly as she could she raised the great bar and fairly dragged Clayton within.

“What was that awful noise?” she whispered, shrinking close to him.