"We entered again their building but Rastin and Thicourt took me first to another room than the one in which I had found myself. They said that their men of knowledge were gathered there to hear of their feat, and to have it proved to them. "'You would not be afraid to return to your own time, Henri?' asked Rastin, and I shook my head. "'I want to return to it,' I told them. 'I want to tell my people there what I have seen--what the future is that they must strive for.' "'But if they should not believe you?' Thicourt asked. "'Still I must go--must tell them,' I said. "Rastin grasped my hand. 'You are a man, Henri,' he said. Then, throwing aside the cloak and hat I had worn outside, they went with me down to the big white-walled room where first I had found myself. "It was lit brightly now by many of the shining glass things on ceiling and walls, and in it were many men. They all stared strangely at me and at my clothes, and talked excitedly so fast that I could not understand. Rastin began to address them. "He seemed explaining how he had brought me from my own time to his. He used many terms and words that I could not understand, incomprehensible references and phrases, and I could understand but little. I heard again the names of Einstein and De Sitter that I had heard before, repeated frequently by these men as they disputed with Rastin and Thicourt. They seemed disputing about me. "One big man was saying, 'Impossible! I tell you, Rastin, you have faked this fellow!' "Rastin smiled. 'You don't believe that Thicourt and I brought him here from his own time across five centuries?' "A chorus of excited negatives answered him. He had me stand up and speak to them. They asked me many questions, part of which I could not understand. I told them of my life, and of the city of my own time, and of king and priest and noble, and of many simple things that they seemed quite ignorant of. Some appeared to believe me but others did not, and again their dispute broke out. "'There is a way to settle the argument, gentlemen,' said Rastin finally. "'How?' all cried. "'Thicourt and I brought Henri across five centuries by rotating the time-dimensions at this spot,' he said. 'Suppose we reverse that rotation and send him back before your eyes--would that be proof?' "They all said that it would. Rastin turned to me. 'Stand on the metal circle, Henri,' he said. I did so. "All were watching very closely. Thicourt did something quickly with the levers and buttons of the mechanisms in the room. They began to hum, and blue light came from the glass tubes on some. All were quiet, watching me as I stood there on the circle of metal. I met Rastin's eyes and something in me made me call goodbye to him. He waved his hand and smiled. Thicourt pressed more buttons and the hum of the mechanisms grew louder. Then he reached toward another lever. All in the room were tense and I was tense. "Then I saw Thicourt's arm move as he turned one of the many levers.