A few years ago, when my first story saw the light, a little fellow, a stranger to me then, but who has since proved himself the truest of friends, wrote me a most welcome letter. He said, among other things: “I have read the book five times through. My nurse, Lily Jones, read the book to me twice, my mamma read the book to me once, and my Aunt Lizzie read the book to me twice, for I can only read in my reading-book.” Now you can understand, I think, how I have wanted to keep that boy for a friend, together with the other children who have proved themselves friendly; and so realizing they were all growing older each year, I have tried in the books I have written since then to keep pace with them, that they might not perhaps outgrow me for a little while yet.