The binding of pamphlets is a mooted point in all libraries. While the British Museum and the Library of Congress treat the pamphlets as a book, binding all separately, this is deemed in some quarters too vexatious and troublesome, as well as needlessly expensive. It must be considered, however, that the crowding together of a heterogenous mass of a dozen or twenty pamphlets, by different authors, and on various subjects, into a single cover, is just as objectionable as binding books on unrelated subjects together. Much time is consumed in finding the pamphlet wanted, among the dozen or more that precede or follow it, and, if valuable or much sought-for pamphlets are thus bound, many readers may be kept waiting for some of them, while one reader engrosses the volume containing all. Besides, if separately bound, a single pamphlet can be far more easily replaced in case of loss than can a whole volume of them. Pamphlets may be lightly bound in paste-board, stitched, with cloth backs, at a small cost; and the compensating advantage of being able to classify them like books upon the shelves, should weigh materially in the decision of the question. If many are bound together, they should invariably be assorted into classes, and those only on the same general topic should be embraced in the same cover. The long series of annual reports of societies and institutions, corporations, annual catalogues, etc., need not be bound separately, but should be bound in chronological series, with five to ten years in a volume, according to thickness. So may several pamphlets, by the same writer, if preferred, be bound together. Libraries which acquire many bound volumes of pamphlets should divide them into series, and number them throughout with strict reference to the catalogue. There will thus be accumulated a constantly increasing series of theological, political, agricultural, medical, educational, scientific, and other pamphlets, while the remaining mass, which cannot be thus classified, may be designated in a consecutive series of volumes, as "Miscellaneous Pamphlets." When catalogued, the title-page or beginning of each pamphlet in the volume, should be marked by a thin slip of unsized paper, projected above the top of the book, to facilitate quick reference in finding each one without turning many leaves to get at the titles. In all cases, the contents of each volume of pamphlets should be briefed in numerical order upon the fly-leaf of the volume, and its corresponding number, or sequence in the volumes written in pencil on the title page of each pamphlet, to correspond with the figures of this brief list. Then the catalogue of each should indicate its exact location, thus: Wilkeson (Samuel) How our National Debt may become a National Blessing, 21 pp. 8vo. Phila., 1863 [Miscellaneous pamphlets, v. 347:3], meaning that this is the third pamphlet bound in vol. 347.