As Tarzan advanced upon the gryfs he imitated as closely as he could recall them the methods and mannerisms of the Tor-o-don, but up to the instant that he stood close beside one of the huge creatures he realized that his fate still hung in the balance, for the thing gave forth no sign, either menacing or otherwise. It only stood there, watching him out of its cold, reptilian eyes and then Tarzan raised his staff and with a menacing "Whee-oo!" struck the GRYF a vicious blow across the face. The creature made a sudden side snap in his direction, a snap that did not reach him, and then turned sullenly away, precisely as it had when the Tor-o-don commanded it. Walking around to its rear as he had seen the shaggy first-man do, Tarzan ran up the broad tail and seated himself upon the creature's back, and then again imitating the acts of the Tor-o-don he prodded it with the sharpened point of his staff, and thus goading it forward and guiding it with blows, first upon one side and then upon the other, he started it down the gorge in the direction of the valley. At first it had been in his mind only to determine if he could successfully assert any authority over the great monsters, realizing that in this possibility lay his only hope of immediate escape from his jailers. But once seated upon the back of his titanic mount the ape-man experienced the sensation of a new thrill that recalled to him the day in his boyhood that he had first clambered to the broad head of Tantor, the elephant, and this, together with the sense of mastery that was always meat and drink to the lord of the jungle, decided him to put his newly acquired power to some utilitarian purpose. Pan-at-lee he judged must either have already reached safety or met with death. At least, no longer could he be of service to her, while below Kor-ul-GRYF, in the soft green valley, lay A-lur, the City of Light, which, since he had gazed upon it from the shoulder of Pastar-ul-ved, had been his ambition and his goal. Whether or not its gleaming walls held the secret of his lost mate he could not even guess but if she lived at all within the precincts of Pal-ul-don it must be among the Ho-don, since the hairy black men of this forgotten world took no prisoners. And so to A-lur he would go, and how more effectively than upon the back of this grim and terrible creature that the races of Pal-ul-don held in such awe?