When I was a child some one gave me a family of white mice. I don't remember how old I was, I think about ten or eleven; but I remember very clearly the day I received them. It must have been a Thursday, a half-holiday, for I had come home from school rather early in the afternoon. Alexandre, dear old ruddy round-faced Alexandre, who opened the door for me, smiled in a way that seemed to announce, "There's a surprise in store for you, sir." Then my mother smiled too, a smile, I thought, of peculiar promise and interest. After I had kissed her she said, "Come into the dining-room. There's something you will like." Perhaps I concluded it would be something to eat. Anyhow, all agog with curiosity, I followed her into the dining-room--and Alexandre followed _me_, anxious to take part in the rejoicing. In the window stood a big cage, enclosing the family of white mice. I remember it as a very big cage indeed; no doubt I should find it shrunken to quite moderate dimensions if I could see it again. There were three generations of mice in it: a fat old couple, the founders of the race, dozing phlegmatically on their laurels in a corner; then a dozen medium-sized, slender mice, trim and youthful-looking, rushing irrelevantly hither and thither, with funny inquisitive little faces; and then a squirming mass of pink things, like caterpillars, that were really infant mice, newborn. They didn't remain infants long, though. In a few days they had put on virile togas of white fur, and were scrambling about the cage and nibbling their food as independently as their elders. The rapidity with which my mice multiplied and grew to maturity was a constant source of astonishment to me. It seemed as if every morning I found a new litter of young mice in the cage--though how they had effected an entrance through the wire gauze that lined it was a hopeless puzzle--and these would have become responsible, self-supporting mice in no time. My mother told me that somebody had sent me this soul-stirring present from the country, and I dare say I was made to sit down and write a letter of thanks. But I'm ashamed to own I can't remember who the giver was. I have a vague notion that it was a lady, an elderly maiden-lady--Mademoiselle ... something that began with P--who lived near Tours, and who used to come to Paris once or twice a year, and always brought me a box of prunes.