The data on which the librarian may rely to accept or reject from a mere list of books are: 1) the author’s name; 2) the title, with such brief annotation as may follow it; 3) notices in the book magazines; 4) the publisher’s name. The author stands for much--the style, method of treatment, the fitness to print of what he has to say, the readableness of his book, and so on. We all know that there are authors whom we can absolutely rely on in these respects, either for acceptance or rejection. It is thus necessary that the librarian may know the uniformly good author and the uniformly bad ones; but experience must be his guide, as this lies somewhat without the scope of the present paper. The title should tell us something about the contents of the book, but, unfortunately, the aim of the title-maker is too often not to give information but to stimulate curiosity. In some cases this is carried so far that the title of a book leaves us in absolute ignorance as to whether it is sociology, travel, or fiction. One is, therefore, generally obliged to refer to some kind of descriptive note to get the desired information. Such notes are often appended to lists and the librarian does well to remember that they are generally not intended to be critical. For criticism we must go to the reviews, and here I have always felt, and still feel, that the librarian has a real grievance. The book periodicals are many, and every daily paper has its critical page. This mass of matter is made accessible through the recently issued Index to books reviewed. Yet with it all there is not one place where the librarian may look for brief notes on current books, telling him just what he wants to know and no more, and with the confidence that the information is quite free from bias. In saying this I am quite ready to give credit to our best book reviews for their many good qualities. What I mean is, that the reviews are written for the reader or the bookseller, never for the librarian. In making use of those at his disposal the librarian must learn to discriminate, to weigh authorities, and to pick out the occasional sharp needle of valuable criticism from the haystack of discursive talk. Lastly, the selector may rely on the name of the publisher. This may tell him much or little, but it may at any rate guarantee good paper and type, and it may also assure him that the book contains no improprieties. Unfortunately, it cannot insure against dullness--publisher’s readers are but mortal, and the best will occasionally reject a pearl and take in a pebble.