Instinctively he changed his course a trifle, to edge toward the metal door. Perhaps, behind it, there was sanctuary for a few moments. Perhaps he could force it open, spring out, and bar it again in the faces of the pursuing mob. It sounded improbable, but at least it offered him a slim chance where before no chance had seemed possible. He reached the door at last, fumbled behind him and felt, high over his head, a massive sliding bolt. * * * * * In the spot Brand had left, the struggle to throw the gravity-lever back into closed contact position went on. The Rogan who was fruitlessly trying to reach up to it paused and said something to one near him. That one halted, and began to crawl toward him. The two of them tried to reach it, one bracing the other and helping him pry his body up from the implacable pull of Jupiter's uninsulated mass. The top Rogan reached a little higher. The flesh sucker-disk that served as a hand almost grasped the lever, but failed by only a few inches. A third Rogan crawled up. And now, with two arching their backs to help the other, the thing was done. The hose-like, groping arm went up and pushed the lever back into place. The blue streamer began to hum and crackle from coil to coil again. The invisible weight that pressed down was released as once more the giant planet's gravity was nullified. The Rogans got eagerly to their feet and began to race toward Brand in their normal long bounds. Brand, just cautiously rising, when the power went back on, found himself leaping five feet into the air with the excess of his muscular effort. And in that leap he saw the Rogans in the rear straighten up and point their tubes. However, also in that leap, his fumbling hand shot back the bolt that securely shut the metal door. With a shout of defiance he jumped out of the door and slammed it shut after him, feeling it grow searing hot an instant later under the impact of the rays from the tubes that had been trained on him. A stinging shock reached him through the metal, flinging him to the ground. He rolled out of its range and leaped to his feet to race away from there. Then, with a gasp, he flattened his body back against the wall of the dome building. He was in the enclosure that held the gigantic, lizard-like thing that had nearly got him on his escape from the tower room. He wheeled frantically to go back and face the Rogan death-tubes. Anything rather than wait while that mammoth heap of tiny-brained ferocity ran him down and tore him to shreds! But even as he turned, he heard the bolt shoot home on the inside of the door; heard vengeful squeals of triumph from his pursuers. * * * * *