Williams--_In_ Manual of book selection. _pp. 20-24._ QUESTIONS. _1._ What guide books would you consult in selecting a nucleus stock of books in philosophy and religion? _2._ How would you be guided in the discarding of obsolete books in this section? _3._ What are the principal periodical guides to new books of religion and philosophy? SOCIOLOGY.--Always a popular class of literature with the reading public. Frequent revision of stock is essential to retain a “live” class. Subjects like political science and statistics must be represented by the latest editions. The following are the chief guides to selection:--Nelson’s “Standard books,” Vol. _1_; Bisseker’s “Student’s library,” _pp. 209-239; 281-297_; Bliss’s “Handbook of socialism”; Bowker and Isle’s “Readers guide to economic, social, and political science”; Fabian Society’s “What to read on social and economic subjects”; Robertson’s “Courses of study”; Sonnenschein’s “Best books,” Vol. _2_; Stammhammer’s “Bibliographie der sozialismus und kommunismus”; “Bibliographie der sozialwissenschaften,” _1905_ to date; Bulkeley’s “Bibliographical survey of contemporary sources for the economic and social history of the War”; Zimand’s “Modern social movements”; and _in_ Williams’s “Manual of book selection,” _pp. 24-26_. QUESTIONS. _1._ How would you find out what later editions are available of books given in the standard guides? _2._ Give a brief account of Gross’s “Bibliography of British municipal history,” and its value in the selection of books on sociology. _3._ Draw up a graded reading course of not more than twelve books on political economy. SCIENCE AND TECHNOLOGY:-- The two most important sections in a public library, as the subjects in both classes continually change and develop. In no other classes do works so soon become obsolete. Before making selection for an initial stock it is advisable to read through as many brief histories of the sciences as possible as they will enumerate the writers whose influence in the various sciences have been greatest. The standard bibliographies must be consulted in selecting initial stock, but when formed, it must be kept alive by a careful reading of the periodical literature, where the latest information will be obtained. As new editions of works in stock are published, they must be purchased if they contain additional or revised material, and take the place of the old edition on the shelf. The British Science Guild’s “Catalogue of British scientific and technical books,” first published in 1921, new and revised edition, 1925, complete with author and subject indexes, together with the numerous guides mentioned in Mudge’s “New guide to reference books,” pp. _23_ (technical lists); _97-104_ and _104-114_ will render ample assistance to the selector, who will also find the British Museum Subject Index most useful for the titles of books in these classes published in England. READING LIST.