seeking knowledge.'

"I felt my confidence returning. These were men such as I had dreamed might some day be. 'But what can you do with time?' I asked. 'Is not time a thing unalterable, unchanging?'

"Both shook their heads. 'No, Henri, it is not. But lately have our men of science found that out.'

"They went on to tell me of things that I could not understand. It seemed they were telling that their men of knowledge had found time to be a mere measurement, or dimension, just as length or breadth or thickness. They mentioned names with reverence that I had never heard—Einstein and De Sitter and Lorentz. I was in a maze at their words.

"They said that just as men use force to move or rotate matter from one point along the three known measurements to another, so might matter be rotated from one point in time, the fourth measurement, to another, if the right force were used. They said that their machines produced that force and applied it to the metal circle from five hundred years before to this time of theirs.

"They had tried it many times, they said, but nothing had been on the spot at that time and they had rotated nothing but the air above it from the one time to the other, and the reverse. I told them of the thunderclaps that had been heard at the spot in the field and that had made me curious. They said that they had been caused by the changing of the air above the spot from the one time to the other in their trials. I could not understand these things.

"They said then that I had happened to be on the spot when they had again turned on their force and so had been rotated out of my own time into theirs. They said that they had always hoped to get someone living from a distant time in that way, since such a man would be a proof to all the other men of knowledge of what they had been able to do.

"I could not comprehend, and they saw and told me not to fear. I was not fearful, but excited at the things that I saw around me. I asked of those things and Rastin and Thicourt laughed and explained some of them to me as best they could. Much they said that I did not understand but my eyes saw marvels in that room of which I had never dreamed.

"They showed me a thing like a small glass bottle with wires inside, and then told me to touch a button beneath it. I did so and the bottle shone with a brilliant light exceeding that of scores of candles. I shrank back, but they laughed, and 

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