It is sometimes the custom of theorists to picture our primordial progenitors as timid, fearful creatures, fleeing from the womb to the grave in constant terror of the countless, savage creatures that beset their entire existence. But as it does not seem reasonable that a creature so poorly equipped for offense and defense could have survived without courage, it seems far more consistent to assume that with the dawning of reason came a certain superiority complex--a vast and at first stupid egotism--that knew caution, perhaps, but not fear; nor is any other theory tenable unless we are to suppose that from the loin of a rabbit-hearted creature sprang men who hunted the bison, the mammoth and the cave bear with crude spears tipped with stone. The Sagoths of Pellucidar may have been analogous in the scale of evolution to the Neanderthal men of the outer crust, or they may, indeed, have been even a step lower; yet in their bearing there was nothing to suggest to Tarzan that they had reached this stage in evolution through the expedience of flight. Their bearing as they trod the jungle trail bespoke assurance and even truculence, as though they were indeed the lords of creation, fearing nothing. Perhaps Tarzan understood their attitude better than another might have since it had been his own always in the jungle--unquestioning fearlessness--with which a certain intelligent caution was not inconsistent. They had come but a short distance from the scene of Tarzan's capture when the Sagoths stopped beside a hollow log, the skeleton of a great tree that had fallen beside the trail. One of the creatures tapped upon the log with his club--one, two; one, two; one, two, three. And then, after a moment's pause, he repeated the same tapping. Three times the signal boomed through the jungle and then the signaler paused, listening, while others stopped and put their ears against the ground. Faintly through the air, more plainly through the ground, came an answering signal--one, two; one, two; one, two, three. The creatures seemed satisfied and climbing into the surrounding trees, disposed themselves comfortably as though settling down to a wait. Two of them carried Tarzan easily aloft with them, as with his hands bound behind his back he could not climb unassisted. Since they had started on the march Tarzan had not spoken, but now he turned to one of the Sagoths near him. "Remove the bonds from my wrists," he said. "I am not an enemy." "Tar-gash," said he whom Tarzan had addressed, "the gilak wants his bonds removed." Tar-gash, a large bull with noticeably long, white canine fangs, turned his savage eyes upon the ape-man. For a long time he glared unblinkingly at the prisoner and it seemed to Tarzan that the mind of the half-brute was struggling with a new idea. Presently he turned to the Sagoth who had repeated Tarzan's request. "Take them off," he said. "Why?" demanded another of the bulls. The tone was challenging.