Dewey, Melvil. Decimal Classification (last ed.), Intro. and Appendix. Institut International de Bibliographie. Classification Décimale, fascicule i. Sayers, W. C. Berwick. Notation. _In his_ Introduction to Library Classification, 1918, p. 68. =255. Classification and Shelf Guides:= Coutts, H. T. Classification and Shelf Guides. _In_ Stewart, J. D., _and others_, Open Access Libraries, 1915. Sayers. Introduction, chapter xii. (_vide supra_). Dewey, Melvil. Shelf List. _In his_ Library School Rules, 1892. For Articles, see Cannons, H 96-108, Shelf Arrangement, etc. DIVISION VIII CATALOGUING, FILING, INDEXING CHAPTER XVIII CATALOGUING METHOD =256. General.=--Of the interior administrative work of the municipal, or even more of the university or institutional library, that which occupies most time and thought is cataloguing. A catalogue is properly defined as an explanatory, logically-arranged inventory and key to the books and their contents, and differs from a bibliography in being confined to the books in a given library. For its production wide knowledge both of cataloguing rules and of general subjects is required, and experience in ordinary reference work is essential. The staff, therefore, to whom the cataloguing is entrusted should be highly trained and well educated; that is to say, that part of the staff which deals with the final processes in cataloguing--the choice of headings, treatment of titles, annotation, selection of added entries, and the filing of the finished material. In large libraries cataloguing staffs are chosen with care, and cataloguing rooms are arranged for the work with a careful regard to the value of natural lighting, of furniture so arranged that the cataloguer has not to rise from his desk every time he wishes to make a reference, and, indeed, with the object of producing the best results at a minimum expenditure of energy. Even in the smallest library, where the librarian does the cataloguing, a preliminary attention to such matters as the construction of the cataloguing table and its accessibility to the inevitable cataloguer’s reference books, will save much labour hereafter. It may not be superfluous to add that as cataloguing is exacting work, it is fatiguing work, and no assistant should be kept at it without variation for a longer time than he can remain mentally alert and fresh. Eye-strain and fatigue mean inaccuracy, and at the best inefficient work, and seven hours is a maximum that should not be exceeded.