that when I set out, before my velocity became very high, Mrs. Watchett had walked across the room, traveling, as it seemed to me, like a rocket. As I returned I passed again across that minute when she traversed the laboratory. But now every motion appeared to be the exact inversion of her previous one. The door at the lower end opened and she glided quietly up the laboratory, back foremost, and disappeared behind the door by which she had previously entered.
"Then I stopped the Machine, and saw about me again the old familiar laboratory, my tools, my appliances, just as I had left them. I got off the thing very shakily and sat down upon my bench. For several minutes I trembled violently. Then I became calmer. Around me was my old workshop again, exactly as it had been. I might have slept there and the whole thing have been a dream.
"And yet not exactly. The thing
