The evidence so far suggested that Gridley had been forced to abandon the plane in air and that he had safely made a parachute descent, but where and under what circumstances he had picked up his companion, Tarzan could not even hazard a guess. He found it difficult to get Thoar away from the aeroplane, the strange thing having so fired his curiosity and imagination that he must need remain near it and ask a hundred questions concerning it. With Tar-Gash, however, the reaction was entirely different. He had glanced at it with only a faint show of curiosity or interest, and then he had asked one question, "What is it?" "This is the thing that passed over us and which you said was a flying reptile," replied Tarzan. "I told you at that time that one of my friends was in it. Something happened and the thing fell, but my friend escaped without injury." "It has no eyes," said Tar-gash. "How could it see to fly?" "It was not alive," replied Tarzan. "I heard it growl," said the Sagoth; nor was he ever convinced that the thing was not some strange form of living creature. They had covered but a short distance along the trail made by Gridley and Jana, after they had left the aeroplane, when they came upon the carcass of a huge pteranodon. Its head was crushed and battered and almost severed from its body and a splinter of smooth wood projected from its skull--a splinter that Tarzan recognized as a fragment of an aeroplane propeller--and instantly he knew the cause of Gridley's crash. Half a mile further on the three discovered further evidence, some of it quite startling. An opened parachute lay stretched upon the ground where it had fallen and at short distances from it lay the bodies of four hyaenodons and two hairy men. An examination of the bodies revealed the fact that both of the men and two of the hyaenodons had died from bullet wounds. Everywhere upon the trampled turf appeared the imprints of the small sandals of Jason's companion. It was evident to the keen eyes of Tarzan that two other men, both natives, had taken part in the battle which had been waged here. That they were of the same tribe as the two that had fallen was evidenced by the imprints of their sandals, which were of identical make, while those of Tarzan's companion differed materially from all the others. As he circled about, searching for further evidence, he saw that the two men who had escaped had run rapidly for some distance toward the mouth of a large canyon, and that, apparently following their retreat, Jason and his companion had set out in search of the plane. Later they had returned to the scene of the battle, and when they had departed they also had gone toward the mountains, but along a line considerably to the right of the trail made by the fleeing natives. Thoar, too, was much interested in the various tracks that the participants in the battle by the parachute had left, but he said nothing until after Tarzan had completed his investigation.