All writing upon the margins of books should be prohibited--other than simple pencil corrections of the text, as to an erroneous date, name, etc., which corrections of errors should not only be permitted, but welcomed, upon due verification. The marking of passages for copying or citation should be tolerated only upon the rigid condition that every user of the book rubs out his own pencil marks before returning it. I have seen lawyers and others thoughtless enough of right and wrong to mark long passages in pen and ink in books belonging to public libraries. This is a practice to be sternly repressed, even at the cost of denying further library privileges to the offender. Turning down leaves in a book to keep the place is one of the easily besetting sins of too many readers. Those who thus dogs-ear a volume should be taught that the vile practice weakens and wears out the leaves thus folded down, and makes the book a more easy prey to dust and disintegration. However busy I may be, I instinctively turn back every turned-down leaf I notice in any book, before using it, or handing it to another. A good safe-guard would be to provide a supply of little narrow strips of paper, in the ticket boxes at the library tables to serve as the book-markers so frequently needed by readers. For this purpose, no thick or smooth calendered paper should be used, which falls out of any loosely bound book too readily--but a thin soft paper un-sized, which will be apt to retain its place. I have lost valuable time (which I shall never see again) in trying to find the pages marked for me by a searcher who had thoughtlessly inserted bits of card-board as markers--which kept falling out by their own weight. The book-marks should be at least two inches long, and not more than half an inch wide; and rough edges are better than smooth ones, for they will adhere better to the head of the volume where placed. Better still it is, to provide paper book-marks forked at the lower end by slitting, then doubled so that the mark will go on both sides of the leaf at once. This is the only sure safe-guard against these bits of paper falling out, and thus losing the place. Never put cards, or letters, or documents, or any solid substance into a book. It weakens the binding, and if continued, often breaks the back. The fact that most of the injuries to which books are exposed are unintentional injuries does not alter the fact that they are none the less injuries to be guarded against. Wilful perpetration of the many abuses referred to may be rare, but the unconscious perpetrators should be instructed how to use books by a vigilant librarian. And they who have thus been taught to be careful of the books in a public library will learn to be more careful of their own, which is a great step in the education of any one.