A catalogue should be as nearly as possible an index to the classification of the Library. It may be compiled on various methods, but nowadays only three forms are generally used; the Dictionary, or alphabet of authors, titles, subjects, forms, etc., in one sequence; the Classed, in the order of the classification, with brief-entry indexes of topics, authors and titles; and Author catalogue plus subject indexes in separates sequences. The Dictionary catalogue is the most common form, and rules for its compilation are more numerous than for any other kind. A very complete code is that of Mr. C. A. Cutter, an American who did much original and influential work for librarianship. Another work chiefly on dictionary cataloguing is the Manual of Cataloguing by Mr. J. H. Quinn. Codes of rules applicable to all varieties of catalogue have been published by the British Museum, the Bodleian Library, the Library Association, the American Library Association, etc., and a joint-code by the two last-named bodies is in preparation. Most codes for
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