They rested for a day among the Kor-ul-JA while Jane investigated the ancient caves of these strange people and then they moved on, avoiding the rugged shoulder of Pastar-ul-ved and winding down the opposite slope toward the great morass. They moved in comfort and in safety, surrounded by their escort of Ho-don and Waz-don. In the minds of many there was doubtless a question as to how the three would cross the great morass but least of all was Tarzan worried by the problem. In the course of his life he had been confronted by many obstacles only to learn that he who will may always pass. In his mind lurked an easy solution of the passage but it was one which depended wholly upon chance. It was the morning of the last day that, as they were breaking camp to take up the march, a deep bellow thundered from a nearby grove. The ape-man smiled. The chance had come. Fittingly then would the Dor-ul-Otho and his mate and their son depart from unmapped Pal-ul-don. He still carried the spear that Jane had made, which he had prized so highly because it was her handiwork that he had caused a search to be made for it through the temple in A-lur after his release, and it had been found and brought to him. He had told her laughingly that it should have the place of honor above their hearth as the ancient flintlock of her Puritan grandsire had held a similar place of honor above the fireplace of Professor Porter, her father. At the sound of the bellowing the Ho-don warriors, some of whom had accompanied Tarzan from Ja-don's camp to Ja-lur, looked questioningly at the ape-man while Om-at's Waz-don looked for trees, since the GRYF was the one creature of Pal-ul-don which might not be safely encountered even by a great multitude of warriors. Its tough, armored hide was impregnable to their knife thrusts while their thrown clubs rattled from it as futilely as if hurled at the rocky shoulder of Pastar-ul-ved. "Wait," said the ape-man, and with his spear in hand he advanced toward the GRYF, voicing the weird cry of the Tor-o-don. The bellowing ceased and turned to low rumblings and presently the huge beast appeared. What followed was but a repetition of the ape-man's previous experience with these huge and ferocious creatures. And so it was that Jane and Korak and Tarzan rode through the morass that hems Pal-ul-don, upon the back of a prehistoric triceratops while the lesser reptiles of the swamp fled hissing in terror. Upon the opposite shore they turned and called back their farewells to Ta-den and Om-at and the brave warriors they had learned to admire and respect. And then Tarzan urged their titanic mount onward toward the north, abandoning him only when he was assured that the Waz-don and the Ho-don had had time to reach a point of comparative safety among the craggy ravines of the foothills.