One glance at the beast ahead of him had convinced him that only by a combination of skill and rare luck could he hope to destroy this titanic monster with the relatively puny weapons with which he was armed, but he might at least divert its attention from the lad and by harassing it draw it away until the boy could find some means of escape. And so it was that within the very instant that his eyes took in the picture his bow twanged and a heavy arrow sank deeply into the back of the bear close to its spine, and at the same time Tarzan voiced a savage cry intended to apprise the beast of an enemy in its rear. Maddened by the pain and surprised by the voice behind it, the creature evidently associated the two, instantly whirling about on the narrow ledge. Tarzan's first impression was that in all his life he had never gazed upon such a picture of savage bestial rage as was depicted upon the snarling countenance of the mighty cave bear as its fiery eyes fell upon the author of its hurt. In quick succession three arrows sank into its chest as it charged, howling, down upon the ape-man. For an instant longer Tarzan held his ground. Poising his heavy spear he carried his spear hand far back behind his right shoulder, and then with all the force of those giant muscles, backed by the weight of his great body, he launched the weapon. At the instant that it left his hand the bear was almost upon him and he did not wait to note the effect of his throw, but turned and leaped swiftly down the trail; while close behind him the savage growling and the ponderous footfalls of the carnivore proved the wisdom of his strategy. He was sure that upon this narrow, rocky ledge, if no obstacle interposed itself, he could outdistance the bear, for only Ara, the lightning, is swifter than Tarzan of the Apes. There was the possibility that he might meet the bear's mate coming up to their den, and in that event his position would be highly critical, but that, of course, was only a remote possibility and in the meantime he was sure that he had inflicted sufficiently severe wounds upon the great beast to sap its strength and eventually to prove its total undoing. That it possessed an immense reserve of vitality was evidenced by the strength and savagery of its pursuit. The creature seemed tireless and although Tarzan was equally so he found fleeing from an antagonist peculiarly irksome and to a considerable degree obnoxious to his self esteem. And so he cast about him for some means of terminating the flight and to that end he watched particularly the cliff walls rising above the trail down which he sped, and at last he saw that for which he had hoped--a jutting granite projection protruding from the cliff about twenty-five feet above the trail.