I need no great effort of memory to recall, in every detail, the rainy autumn evening when I stood with my father in one of the more frequented streets of Moscow, and felt that I was gradually being overcome by a strange illness. I had no pain at all, but my legs were giving way under me, the words stuck in my throat, my head slipped weakly on one side . . . It seemed as though, in a moment, I must fall down and lose consciousness.