"We shall see," said Thoar, "but if he has taken Jana against her wishes, he must die." As Tarzan, Tar-gash and Thoar followed the spoor of Jason and Jana a disheartened company of men rounded the end of the great Mountains of the Thipdars, fifty miles to the east of them, and entered the Gyor Cors, or great Plains of the Gyors. The party consisted of ten black warriors and a white man, and, doubtless, never in the history of mankind had eleven men been more completely and hopelessly lost than these. Muviro and his warriors, than whom no better trackers ever lived, were totally bewildered by their inability even to back-track successfully. The stampeding of the maddened beasts, from which they had barely escaped with their lives and then only by what appeared nothing short of a miracle, had so obliterated all signs of the party's former spoor that though they were all confident that they had gone but a short distance from the clearing, into which the beasts had been herded by the tarags, they had never again been able to locate the clearing, and now they were wandering hopelessly and, in accordance with Von Horst's plans, keeping as much in the open as possible in the hope that the cruising O-220 might thus discover them, for Von Horst was positive that eventually his companions would undertake a search for them. Aboard the O-220 the grave fear that had been entertained for the safety of the thirteen missing members of the ship's company had developed into a conviction of disaster when Gridley failed to return within the limit of the time that he might reasonably be able to keep the scout plane in the air. Then it was that Zuppner had sent Dorf out with another searching party, but at the end of seventy hours they had returned to report absolute failure. They had followed the trail to a clearing where jackals fed upon rotting carrion, but beyond this there was no sign of spoor to suggest in what direction their fellows had wandered. Going and coming they had been beset by savage beasts and so ruthless and determined had been the attacks of the giant tarags that Dorf reported to Zuppner that he was confident that all of the missing members of the party must by this time have been destroyed by these great cats. "Until we have proof of that, we must not give up hope," replied Zuppner, "nor may we relinquish our efforts to find them, whether dead or alive, and that we cannot do by remaining here." There was nothing now to delay the start. While the motors were warming up, the anchor was drawn in and the air expelled from the lower vacuum tanks. As the giant ship rose from the ground Robert Jones jotted down a brief note in a greasy memorandum book: "We sailed from here at noon." When Skruk and his companion had left the field to the victorious Jason, the latter had returned his six-gun to its holster and faced the girl. "Well," he inquired, "what now?"