Sayers (W. C. B.)--Canons of classification applied to “The Subject,” “The Expansive,” “The Decimal,” and “Library of Congress” classifications: a study in bibliographical classification method. _Grafton, 1915. 3s. 6d._ Sayers (W. C. B.)--An introduction to library classification, theoretical, historical and practical; and, A short course in practical classification; with readings, questions and examination papers. _Grafton, 1922. 10s. 6d._ _Lesson 1._ INTRODUCTION. MEANING, PURPOSE, AND UTILITY. TERMINOLOGY. LOGICAL BASES. In classification, more than in any other branch of library science, practical application is dependent on a sound knowledge of theoretical principles, and students are warned that a thorough grasp of the logical bases is an absolutely essential preliminary to successful practical work. Importance of classification in our daily life is not fully appreciated, classification being the sole foundation of all order. It would be impossible for the mental faculties to function efficiently without classification, the simplest thought or reason requiring its use. Note the purpose of classification and the mutual dependence of classification and cataloguing. It is essential to know the exact logical meaning of terms used in classification. Understand the Five Predicables. After mastering their definition, study Tree of Porphyry for their application. A close study of the latter will amply repay students. It admirably illustrates meaning of Extension and Intension, and demonstrates how in the framing of the scheme the hierarchy must proceed gradually from terms of great Extension and little Intension to terms of little Extension but of great Intension. The student is strongly advised not to pass Jevons until he has thoroughly mastered the chapters set out below. READING LIST. Brown--Library classification. _Chap. 6._ Encyclopædia Britannica--Article _Classification_. Jast--Classification and discovery. _L.W. Vol. 13, 1910-11, pp. 353-355._ Jast--Library classification. _In Greenwood’s Library Year Book, 1900-01, pp. 21-36._ Jevons--Logic. (_Give special attention to Chaps. 5, 12 and 32_). Jevons--Principles of science. _Chapter on classification._ Mill--Logic. _Chapter on classification._ Richardson--Classification. _Introduction and Chap. 1._ Sayers--Classification in modern life. _L.A. Vol. 17, 1924, pp. 8-16; 35-40._ Sayers--Introduction. _Chaps. 1-2._ QUESTIONS. _1._ Give an example where classification resulted in the discovery of new facts. _2._ State what you consider to be the purpose of classification. _3._ Define the following terms:--characteristic; denotation; correlation of property; extension; genus; connotation; difference; intension. _4._ Describe the Tree of Porphyry and its relation to classification. _5._ The functions of classification and those of cataloguing are often confused. Explain. _Lesson 2._ PRINCIPLES. KINDS OF CLASSIFICATION. SCHEDULES.