I am speaking now of a genuine letter, “a link between two personalities,” as it has been defined. There are two varieties of letters which are not genuine. The first of these is the open letter, the letter to the editor, letter to a noble lord, etc. This is really addressed to the public through the medium of a more or less imaginary correspondent. The Englishman’s habit of writing to the _London Times_ on all occasions is proverbial. Professor Goldwin Smith is a living example of the practice, transplanted to the field of the American newspaper press. But _private_ letters written with an eye to publication are spoiled in the act. To be natural they should not mean to be overheard. If afterwards, by reason of the eminence of the writer, or of some quality in the letters themselves, they get into print, let it be by accident and not from forethought. Why is it, then, that the best printed letters, such as Gray’s, Walpole’s, Cowper’s, Fitzgerald’s, written with all the ease and intimacy of confidential intercourse—“written _from_ one man and _to_ one man”—are found to be composed in such perfect English, with such high finish, filled with matter usually reserved by professional authors for their essays or descriptive sketches; in fine, to be so literary? The reason I take to be partly in the mutual intellectual sympathy between writer and correspondent; and partly in the conscientious literary habit of the letter writer. Hawthorne’s “Note Books,” intended only for his own eye, are written with almost as much care as the romances and tales into which many pages of them were decanted with little alteration.