Yet they had been, I knew, and knew too that the sixty-odd days that remained to us before the end came, before the sun, spinning ever faster beneath the pressure of the giant ray from Triton, split at last into a double star, that these three-score days would seem centuries on centuries of agonizing torment for us two, who must wait, imprisoned here, for the doom that was closing down upon the solar system to come to its dread climax. And at that thought, at the thought of that helpless inaction that must be ours, a blind unreasoning revolt arose in me as in Marlin, and like him I sprang to my feet, paced the little cell's length with clenched hands. All was unchanged about us, the towering black walls around us, the half-heard staccato voices of the Neptunian guards outside, the dim roar of sound that came to us through the twilight from Triton's swarming sunward side. The very changelessness of the things about us pressed upon my spirits with such suffocating force in that moment, that I was almost on the point of beating blindly against the cell's door, when recalled to myself by the suddenly tense tones of Marlin's voice, beside me. "Hunt!" he exclaimed. "There _is_ a chance to get out, I think! I've been thinking, and if we can make a great enough effort I think that we can win clear of this cell, at least!" I shook my head. "It's no use, Marlin," I said. "We've gone over it all a thousand times--there's no way out but through the door, and that never opens but with a half-dozen Neptunian guards standing with ray-tubes outside it." "But there is another way," he persisted. "Out the cell's top, Hunt, out the roofless top!" "We tried it," I told him, "and it was useless. Even with the lesser gravitation here on Triton, even without these weights on our feet, we could only jump a score or more feet straight upward, and the walls are two hundred feet high and utterly smooth and vertical." "But one way we didn't try," he insisted, and as I listened with dull lack of interest, he went on to outline to me his idea. And as I listened, my indifference suddenly vanished, for I saw that Marlin's keen, inventive brain had really found a plan that would give us a chance of escape. "It's our one hope," he finished, "and if we can use it to get out of this cell, we'll have a chance to steal one of these cylinders of the Neptunians and get back to Earth in it in time!" "We'll try it at once, then," I said, excited now at this faint gleam of hope. "For the changing-hour for the Neptunians on the dark and sunward sides comes soon, and we don't know how soon those Neptunian scientists, who are to question us, will be coming here." * * * * *