Brown--Manual of library economy. _3rd edition. Chap. 16._ Brown--Subject classification. _Introduction._ Dewey--Decimal classification. _Introduction._ Dickie--Critical examination of the arrangement of History and Geography in the Decimal and Subject classifications. _L.W. Vol. 25, 1922-23, pp. 401-407._ Hale--The decimal classification as applied to small libraries. _L.W. Vol. 16, 1913-14, pp. 263-268; 311-316._ Mash--Classification of technology. _L.W. Vol. 15, 1912-13, pp. 1-5; 50-55._ Mould--Wanted, a classification. _L.A.R. Vol. 8, 1906, pp. 127-147; 208-211._ Pepper--Classification of biography. _L.A.R. Vol. 15, 1913, pp. 328-334._ Richardson--Classification. _Appendix._ Sayers--Canons. _Chaps. 3-6._ Sayers--The Dewey decimal classification after thirty years. _L.A.R. Vol. 12, 1910, pp. 314-334._ Sayers--Introduction. _Chaps. 7-10._ Smith--Library classifications: a comparison by classes. _Supp. to. L.W. Vol. 21, 1918-19._ Smither--Library of Congress classification. _L.W. Vol. 16, 1913-14, pp. 130-136._ South Kensington Museum; Board of Education. Classification for works on pure and applied science in the Science Library, the Science Museum. _2nd edition. Stationery Office, 1921._ This classification affords a clear and accurate view of the anatomy of the literature of the pure and applied sciences in the twentieth century. Walker--Suggested re-arrangement of the Dewey classes of _100_ and _200_. _L.W. Vol. 16, 1913-14, pp. 163-165._ Wright--Technological classification. _L.W. Vol. 18, 1915-16, pp. 312-316; 344-347. Vol. 19, 1916-17, pp. 9-10._ Brown’s Subject Classification was published in 1906 and reviews and criticisms of the work can be read in the following professional periodicals:--Savage (E. A.) _in L.W. Vol. 9, 1906-07, pp. 48-55_. Lyster (T. W.) _in L.A.R. Vol. 8, 1906, pp. 384-386_. Coutts (A. T.) _in L.A. Vol. 6, 1909, pp. 304-318_. Brown’s Revisions, etc., _in L.W. Vol. 12, 1909-10, pp. 41-45; 81-86; 121-124; 153-160_. QUESTIONS. _1._ Write a brief essay on the history of classification. _2._ Outline Bacon’s Scheme and its influence on classification. _3._ Give a brief account of any natural scheme of classification. _4._ State in which class or classes it is preferable to adopt an alphabetical arrangement, and why. _5._ The Divisions 140 Philosophic Systems, 180 Ancient Philosophers, and 190 Modern Philosophers in the Decimal Classification are not satisfactory to the classifier. Explain. _6._ What means are provided in the Decimal, Subject and Expansive Classifications for obtaining alphabetical and chronological arrangements of a particular subject? _Lesson 4._ NOTATION. EXPANSIONS. MNEMONICS. AUTHOR MARKS. ARRANGEMENT. GUIDING. Notation affects in a very large degree the usefulness and even the librarian’s choice of a scheme.