The subject of second consideration was that of his own escape and return to the O-220. He had it in his mind that at nightfall the beasts might retire and unconsciously he glanced upward at the sun to note the time, when the realization came to him that there would never be any night, that forever throughout all eternity it would be noon here. And then he began to wonder how long he had been gone from the ship, but when he glanced at his watch he realized that that meant nothing. The hour hand might have made an entire circle since he had last looked at it, for in the excitement of all that had transpired since they had left the O-220 how might the mind of man, unaided, compute time? But he knew that eventually the beasts must get their fill and leave. After them, however, there would be the hyaenodons and the jackals with their fierce cousins, the wild dogs. As he watched these, sitting at a respectful distance from the tigers or slinking hungrily in the background, he realized that they might easily prove as much of a bar to his escape as the saber-tooth tigers themselves. The hyaenodons especially were most discouraging to contemplate. Their bodies were as large as that of a full grown mastiff. They walked upon short, powerful legs and their broad jaws were massive and strong. Dark, shaggy hair covered their backs and sides, turning to white upon their breasts and bellies. Gnawing hunger assailed Jason Gridley and also an overpowering desire to sleep, convincing him that he must have been many hours away from the O-220, and yet the beasts beneath him continued to feed. A dead thag lay at the foot of the tree in which the American kept his lonely vigil. So far it had not been fed upon and the nearest tiger was fifty yards away. Gridley was hungry, so hungry that he eyed the thag covetously. He glanced about him, measuring the distance from the tree to the nearest tiger and trying to compute the length of time that it would take him to clamber back to safety should he descend to the ground. He had seen the tigers in action and he knew how swiftly they could cover ground and that one of them could leap almost as high as the branch upon which he sat. Altogether the chance of success seemed slight for the plan he had in mind in the event that the nearest tiger took exception to it. But great though the danger was, hunger won. Gridley drew his hunting knife and lowered himself gently to the ground, keeping an alert eye upon the nearest tiger. Quickly he sliced several long strips of flesh from the thag's hind quarter. The tarag feeding fifty yards away looked up. Jason sliced another strip, returned his knife to its sheath and climbed quickly back to safety. The tarag lowered its head upon its kill and closed its eyes. The American gathered dead twigs and small branches that still clung to the living tree and with them he built a small fire in a great crotch.