Randall saw the creature's gaze turn from one to another of them, and then heard the hiss of his voice as he pointed a taloned paw toward Milton. Instantly two of the guards had seized Milton and had jerked him out from the wall, the other guards holding back Randall and Lanier with threatening tubes. It was upon Milton that the fatal choice had fallen! Randall and Lanier made together a half-movement forward, but Milton, a tense message in his eyes, forced them back. The guards who held the physicist led him, at the direction of the Martian scientist, toward a great upright frame at the room's far end, upon which were clustered a score of dial-indicators. From these flexible cords led; and now the scientists began attaching these by clips to various spots on Milton's body. Some mechanical examination of his bodily characteristics were apparently to be made. Milton shot suddenly a glance at the two by the wall, and his head nodded in an almost imperceptible signal. The muscles of Lanier and Randall tensed. Then abruptly Milton seemed to go mad. He shouted aloud in a terrible voice, and at the same moment tore from him the cords just attached, his fists striking out then at the amazed Martians around him. As they leaped back from that sudden explosion of activity and sound on Milton's part the guards before Randall and Lanier whirled instinctively for an instant toward it. And in that instant the two had leaped. * * * * * It was upward they leaped, with all the force of their earthly muscles, toward the big window-opening a half-dozen feet in the wall above them. Like released steel springs they sat up, and Randall heard the thump of their feet as they struck the opening's sill, heard wild cries suddenly coming from beneath them, as the guards turned back toward them. Crimson rays clove up like light toward them, but the instant's surprise had been enough, and in it they had leaped on and through the opening, into the outside night! As they shot downward and struck the metal paving outside, Randall heard a wild babble of cries from inside. A moment he and Lanier gazed frenziedly around them, then were running with great leaps along the base of the building from which they had just escaped. In the darkness of night the Martian city stretched away to their right, its massive dark cone-structures outlined by points of glowing ruddy light here and there upon them. Beside the city's metal streets were illuminated by the brilliant field of stars overhead and by the soft light of the two moons, one much larger than the other, that moved among those stars. Along the street crocodilian Martians were coming and going still, though in small numbers, there being but few in sight in the dim-lit street's length. Lanier pointed ahead as they leaped onward. "Straight onward, Randall!" he jerked. "There seem fewer of the Martians this way!" "But the great cone of the matter-station is the other way!" Randall exclaimed.