In the brief instant that he waited for the impact, the air was rent by as horrid a scream as had ever broken upon the ears of the ape-man and the bellowing of the bull rose suddenly to a higher pitch and mingled with that other awesome sound. Once more the dangling body of the ape-man revolved and his eyes fell upon such a scene as had not been vouchsafed to men of the outer world for countless ages. Upon the massive shoulders and neck of the great thag clung a tiger of such huge proportions that Tarzan could scarce credit the testimony of his own eyes. Great saber-like tusks, projecting from the upper jaw, were buried deep in the neck of the bull, which, instead of trying to escape, had stopped in its tracks and was endeavoring to dislodge the great beast of prey, swinging its huge horns backward in an attempt to rake the living death from its shoulders, or again shaking its whole body violently for the same purpose and all the while bellowing in pain and rage. Gradually the saber-tooth changed its position until it had attained a hold suited to its purpose. Then with lightning-like swiftness it swung back a great forearm and delivered a single, terrific blow on the side of the thag's head--a titanic blow that crushed that mighty skull and dropped the huge bull dead in its tracks. And then the carnivore settled down to feast upon its kill. During the battle the saber-tooth had not noticed the ape-man; nor was it until after he had commenced to feed upon the thag that his eye was attracted by the revolving body swinging above the trail a few yards away. Instantly the beast stopped feeding; his head lowered and flattened, his upper lip turned back in a hideous snarl. He watched the ape-man. Low, menacing growls rumbled from his cavernous throat; his long, sinuous tail lashed angrily as slowly he arose from the body of his kill and advanced toward Tarzan of the Apes. III THE GREAT CATS The ebbing tide of the great war had left human flotsam stranded upon many an unfamiliar beach. In its full flow it had lifted Robert Jones, high private in the ranks of a labor battalion, from uncongenial surroundings and landed him in a prison camp behind the enemy line. Here his good nature won him friends and favors, but neither one nor the other served to obtain his freedom. Robert Jones seemed to have been lost in the shuffle. And finally, when the evacuation of the prison had been completed, Robert Jones still remained, but he was not downhearted. He had learned the language of his captors and had made many friends among them. They found him a job and Robert Jones of Alabama was content to remain where he was. He had been graduated from body servant to cook of an officers' mess and it was in this capacity that he had come under the observation of Captain Zuppner, who had drafted him for the O-220 expedition.