It is with a certain sense of irritation that we again mention the misuse of library books,-a subject, alas, only too patent to everyone who makes use of the library. Again and again have complaints been made that the books were being injured by interlinings, scorings, marginal notes, etc., and only a few weeks ago we had occasion to call attention to the outrageous misuse of a library book in this manner. There seems to be a set of literary vandals who feel it incumbent upon them to write as marginal notes whatever may occur to them on the perusal of a book, quite regardless of the fact that such notes are not only utterly worthless, but oftentimes very annoying to another. Of course every one has a right to cover his own books with any reflections he may choose to disfigure them with, but when such an one scribbles on library books,-books passing through so many hands,-he performs an act of extreme vandalism. Novels and biographies seem to be made the especial sufferers by these persons, and even the magazines do not escape being occasionally found with short articles clipped from them. It ought to be unnecessary to pass any such comment as the above on students here at Harvard for this childish and annoying habit, but the frequency with which one comes across their acts leads us to again mention it.