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Research Council; International Catalogue of Scientific Literature; Wright's Aids to Geographical Research.

Government. See Economics and Sociology.

History. Larned's History for Ready Reference; Ploetz's Manual of Universal History; Putnam's Tabular views of Universal History; Jameson's Dictionary of United States History; Low and Pulling's Dictionary of English History; Larned's Literature of American History; Channing and Hart's Guide to the Study of American History; Channing's History of the United States; McMaster's History of the United States; Cambridge Modern History; and other sets of American, English and European History. In looking up historical information the date of the event must be found first and then historical works treating of that period may be found by use of the catalogue, reference to articles in encyclopedias, and other works mentioned above.

Literature. Poole's Index to Periodical Literature; Readers' Guide; International Index to Periodicals; A. L. A. Index to General Literature; Moulton's Library of Literary Criticism; Book Review Digest; Warner's Library of the World's Best Literature; Bookman. For Dramas, Dramatic Index; Bulletin of Bibliography; Book

man; Poet-Lore; Drama. For the Short Story, Firkins' Index to Short Stories; Hanni

gan's Standard Index to Short Stories; Best Short Stories

for the different years; Bookman. For Poetry and Novels, General Indexes to Periodical

Literature, Book Review Digest; Bookman.

Medicine. Index Medicus; Quarterly Cumulative Index to Current Medical Literature; Index-Catalogue of Surgeon General's Office; International Abstract of Surgery; Reference Handbook of Medical Sciences; Cyclopedias of Medicine and Surgery.

Music. Grove's Dictionary of Music and Musicians; Hubbard's American History and Encyclopedia of Music; University Musical Encyclopedia; International Who's Who in Music.

Philosophy. Baldwin's Dictionary of Philosophy and Psychology

Physics. Science Abstracts; International Catalogue of Scientific Literature; Industrial Arts Index.

Physiology. Physiological Abstracts; International Catalogue of Scientific Literature; Index Medicus; Index-Catalogue of Surgeon General's Office; Chemical Abstracts; Experiment Station Record.

Psychology. Psychological Index; Review of Neurology and Psychiatry; Baldwin's Dictionary of Philosophy.

Religion. Hasting's Cyclopedia of Religion and Ethics; Schaff-Herzog's Encyclopedia of Religious Knowledge; Hasting's Dictionary of the Bible; Jewish Encyclopedia; Catholic Encyclopedia.

School. See Education.

Science. Science Abstracts; Industrial Arts Index; Indexes to General Periodicals.

Taxation. See Economics. Proceedings of National Tax Association.

Technology. See Chemistry. Engineering.

Zoology. Bibliographica Zoologica; International Catalogue of Scientific Literature; Zoological Record; Review of Bacteriology, Protozoology, and general Parasitology; Stiles and Hassall's Index-Catalogue of Medical and Veterinary Zoology; Dictionaries and Cyclopedias of Birds, Animals, and Natural History.

The exact title and number of volume of the principal research journals mentioned above are as follows: Agriculture. Agricultural index, monthly. New York, H. W. Wilson Co.

9 annual volumes (1924). Experiment station record, monthly. Washington, Gov't

Print. office. 51 vols. (1924.) Arnett, Elements of Library Methods.

5

13 vols.

Bibliographie der Pflanzenschutzliteratur, annually. Berlin,

Ulmer. Vol. 1, 1914–19. (Continues, Jahresbericht über das Gebiet der Pflanzenkrankheiten, 1-16;

1898–1913.) Botany. Botanical abstracts, monthly. Ithaca, N. Y.

(1924.) Just's botanischer Jahresbericht; systematisch geordnetes

Repertorium der botanischen Literatur aller Länder.

Leipzig, Bornträger. 41 vols. (1913.) Chemistry. Chemical abstracts, semimonthly. Easton, Pa. American

chemical society. 18 vols. (1924.) Journal of chemical society, monthly. London, Chemical

society. 126 vols. (1924.) Engineering. Engineering index, monthly. New York, Amer. Soc. of

mechanical engineers. 4 vols. (1884–1905); and 19

annual volumes. (1924.) Industrial arts index, monthly, except July and November.

New York, H. W. Wilson Co. 12 vols. (1924.) Technical review; a review and digest of the technical

press of all countries and a survey of engineering industry throughout the world, semi-monthly. London, Technical review. 10 vols. (1924.)

Law.

Index to legal periodicals and law library journal, quarterly.

New York, H. W. Wilson Co. 17 vols. (1924) Mathematics. Jahrbuch über die Fortschritte der Mathematik, irregular.

Berlin, Reimer. 46 vols. (1924.)

Medicine.

Abstracts of bacteriology, monthly. Baltimore, Williams

and Wilkins. 8 vols. (1924.) (Also includes refer

ences on animal and plant pathology.) Centralblatt für Bakteriologie, Parasitenkunde und Infek

tionskrankheiten, zweite Abteilung, monthly. Jena, Gustav Fischer. 57 vols. (1924.) (Also includes reference on

animal and plant pathology.) Index medicus; a quarterly classified record of the current

medical literature of the world. Washington, Carnegie

Institution. 43 vols. (1924.) ) Physiological abstracts; issued by the Physiological Society, monthly. London. Lewis Company. 9 vols. (1924.)

9 Review of bacteriology, protozoology, and general para

sitology; an epitome of general parasitology, bacteriology, and allied subjects in their relationships to pathology

and hygiene, bimonthly. London. 13 vols. (1924.) Psychology. Psychological index, annual. Lancaster, Pa. Psychological

review Co. 30 vols. (1924.) Science. Science abstracts, monthly. London, Spon. 27 vols. (1924.)

(Devoted to the subjects of physics and electricity.)

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

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