XI THE CAVERN OF CLOVI As Tarzan swarmed up the rope the bear, almost upon his heels and running swiftly, squatted upon its haunches to overcome its momentum and came to a stop directly beneath him. And then it was that there occurred one of those unforeseen accidents which no one might have guarded against. It chanced that the granite projection across which Tarzan had cast his noose was at a single point of knife-like sharpness upon its upper edge, and with the weight of the man dragging down upon it the rope parted where it rested upon this sharp bit of granite, and the Lord of the Jungle was precipitated upon the back of the cave bear. With such rapidity had these events transpired it is a matter of question as to whether the bear or Tarzan was the more surprised, but primitive creatures who would survive cannot permit surprise to disconcert them. In this instance both of the creatures accepted the happening as though it had been planned and expected. The bear reared up and shook itself in an effort to dislodge the man-thing from its back, while Tarzan slipped a bronzed arm around the shaggy neck and clung desperately to his hold while he dragged his hunting knife from its sheath. It was a precarious place in which to stage a struggle for life. On one side the cliff rose far above them, and upon the other it dropped away dizzily into the depth of a gloomy gorge, and here the efforts of the cave bear to dislodge its antagonist momentarily bade fair to plunge them both into eternity. The growls and roars of the quadruped reverberated among the mighty peaks of the Mountains of the Thipdars, but the ape-man battled silently, driving his blade repeatedly into the back of the lunging beast, which was seeking by every means at its command to dislodge him, though ever wary against precipitating itself over the brink into the chasm. But the battle could not go on forever and at last the blade found the spinal cord. The creature stiffened spasmodically and Tarzan slipped quickly from its back. He found safe footing upon the ledge as the mighty carcass stumbled forward and rolled over the edge to hurtle downward to the gorge's bottom, carrying with it four of Tarzan's arrows and his spear. The ape-man found his rope lying upon the ledge where it had fallen, and gathering it up he started back along the trail in search of the bow that he had been forced to discard in his flight, as well as to find the boy. He had taken only a few steps when, upon rounding the shoulder of a crag, he came face to face with the youth. At sight of him the latter stopped, his spear ready, his stone knife loosened in its sheath. He had been carrying Tarzan's bow, but at sight of the ape-man he dropped it at his feet, the better to defend himself in the event that he was attacked by the stranger. "I am Tarzan of the Apes," said the Lord of the Jungle. "I come as a friend, and not to kill."