y; Channing's History of the United of the United States; Cambridge of American, English and European rical information the date of the nd then historical works treating by use of the catalogue, reference nd other works mentioned above. to Periodical Literature; Readers' to Periodicals; A. L. A. Moulton's Library of Literary ; Warner's Library of the World's ; Bulletin of Bibliography; Book na. s' Index to Short Stories; Hannio Short Stories; Best Short Stories Bookman. General Indexes to Periodical w Digest; Bookman. s; Quarterly Cumulative Index to dex-Catalogue of Surgeon General's of Surgery; Reference Handbook edias of Medicine and Surgery. nary of Music and Musicians; ་ and Encyclopedia of Music; dia; International Who's Who in Psychology. Psychological Index; F Psychiatry; Baldwin's Dictionary of Phi Religion. Hasting's Cyclopedia o Schaff-Herzog's Encyclopedia of Religio Dictionary of the Bible; Jewish Encyclopedia. School. See Education. Science. Science Abstracts; Indust to General Periodicals. Taxation. See Economics. Proc Association. Technology. See Chemistry. Eng Zoology. Bibliographica Zoologica of Scientific Literature; Zoological Record Protozoology, and general Parasitology Index-Catalogue of Medical and Veterina and Cyclopedias of Birds, Animals, an The exact title and number of research journals mentioned above are Agriculture. Agricultural index, monthly. New Arnett, Elements of Library Methods. Index medicus; a quarterly classif medical literature of the world Institution. 43 vols. (1924.) Physiological abstracts; issued by monthly. London. Lewis Con Review of bacteriology, protozoo sitology; an epitome of general p and allied subjects in their re and hygiene, bimonthly. Lond Psychology. Psychological index, annual. Land review Co. 30 vols. (1924.) Science. Science abstracts, monthly. Londo CLASSIFICATION. In order that the books of a library may be easily consulted and easily located they are arranged on the shelves in classes according to similarity of subject matter. Those on the subject of mathematics are grouped together, those on physics together, those on chemistry, history and so on. They are arranged according to a scheme of classification and the process of determining the place of a book in such a scheme and assigning the corresponding mark or symbol is book classification. A library of much size that is not classified is of little value for use. In general classification is the process of grouping things, objects or ideas, according to likeness or difference. The theory of the subject is discussed chiefly in books on logic; because classification, or association, of ideas, a mental function, is regarded as a branch of logic. But classification, however, is a process common to all the sciences. Classification of animals, plants, minerals, books or other objects presupposes some scheme providing places for the different families or orders and some basis for the determination of the likeness or unlikeness. Each place in the scheme is named and that name represents certain characteristics. The basis for classification is one or more fundamental characteristics. Animals, flowers, or books might be classified by color, or by size, but in neither case is color or size the true basis of classification. Plants and animals are classified according to structure and function and books according to character of subject matter. But plants and animals differ from books in other respects. The plant or animal for some generations is true to type, that is the difference between the individuals of successive gener |