with the curvature of space, quite changing the conceptions that we had all followed since Einstein. I had long ago mastered the last detail of Einstein's theory, as had, in time, the rest of the world. I threw myself immediately into the study of this new, epoch-making conception.

To my amazement, it all seemed to me curiously dim and elusive. I could not quite grasp what Zarentzov was trying to formulate.

"Why," I cried, "the thing is a monstrous fraud!" I went to the professor of Physics in the University I then attended, and I told him it was a fraud, a huge book of mere nonsense. He looked at me rather pityingly.

"I am afraid, Modevski," he said, addressing me by the name I was at the time using, "I am afraid you do not understand it, that is all. When your mind has broadened, you will. You should apply yourself more carefully to your Physics." But that angered me, for I had mastered my Physics before he was ever born. I challenged him to explain the theory. And he did! He put it, obviously, in the clearest language he could. Yet I understood nothing. I stared at him dumbly, until he shook his head impatiently, saying that it was useless, that if I could not grasp it I would simply have to keep on studying. I was stunned. I wandered away in a daze.

For do you see what happened? During all those years I had studied ceaselessly, and my mind had been clear and quick as the day I first had left the hospital. But all that time I had been able only to remain what I was—an extraordinarily intelligent man of the twentieth century. And the rest of the race had been progressing! It had been swiftly gathering knowledge and power and ability all that time, faster and faster, while I had been only remaining still. And now here was Zarentzov and the teachers of the Universities, and, probably, a hundred intelligent men, who had all outstripped me! I was being left behind.

And that is what happened. I need not dilate further upon it. By the end of that century I had been left behind by all the students of the world, and I never did understand Zarentzov. Other men came with other theories, and these theories were accepted by the world. But I could not understand them. My intellectual life was at an end. I had nothing more to understand. I knew everything I was capable of knowing, and, thenceforth, I could only play wearily with the old ideas.

Many things happened in the world. A time came when the East and West, two mighty unified hemispheres, rose up in arms: the civil war of a planet. I recall only chaotic visions of fire and thunder and hell. It was all incomprehensible to me: like a bizarre dream, things happened, people rushed about, but I never knew what they were doing. I lurked during all that time in a tiny shuddering hole under the city of Yokohama, and by a miracle I survived. And the East won. But it seems to have mattered little who did win, for all the world had become, in all except its few remaining prejudices, a single race, and nothing was changed when it was all rebuilt again, under a single government.

I saw the first of the strange creatures who appeared among us in the year 6371, men who were later known to be from the planet Venus. But they were repulsed, for they were savages compared with the Earthmen, although they were about equal to the people of my own century, 1900. Those of them who did not perish of the cold after the intense warmth of their world, and those who were not killed by our hands, those few returned silently home again. And I have always regretted that I had not the courage to go with them.

I watched a time when the world reached perfection in mechanics, when men could accomplish anything with a touch of the finger. Strange men, these creatures of the hundredth century, men with huge brains and tiny shriveled bodies, atrophied limbs, and slow, ponderous movements on their little conveyances. It was I, with my ancient compunctions, who shuddered when at last they put to death all the