BOOK REVIEWS

Book reviewed in this article: Calculus, by Egbert J Miles Projective Geometry, by John Wesley Young The Aryabhatiya of Aryabhata. Translated with notes by Walter Eugene Clark Trigonometry, by A. R. Crathorne and E. B. Lytle Mathematical Introduction to Economics by Griffith C. Evans Lecture Experiments in Optics, by B. K Johnson General Chemistry, by Harry N. Holmes A Laboratory Manual of General Chemistry, by William J. Hale, Director, Organic Chemical Research, Dow chemical Co., revised by William G. Smeaton A Second Course in Algebra, by Harry C. Barber Junior Mathematics, by George Drayton Strayer, Professor of Education, Columbia University and Clifford Brewster Upton, Professor of Mathematics, Columbia University The Theory of the Potential by W. D. MacMillan Stuff, The Story of Materials in the Service of Man by Pauline G. Beery The Essentials of Psychology, by W. B. Pillsbury The Teaching of Secondary Mathematics, by Jasper O. Hassler, Professor of Mathematics, University of Oklahoma, and Rolland R. Smith, Central High School, Springfield, Mass Astronomy by Robert H. Baker The Radio Amateur's Handbook, by A. Frederick Collins, Inventor of the Wireless Telephone 1899. Revised and reset (1930). Edited by George C. Baxter Rowe Manual of Trigonometry for Colleges, Universities and Technical Schools, by E. C. Kennedy laboratory Manual of Physics, by Clinton Maury Kilby Exercise and Problems in Elementary Economic Geography, by W. O. Blanchard A Laboratory Workbook to accompany Chemistry for Today by William McPherson and William Edwards Henderson, both Professors of Chemistry in the Ohio State University, and George Winegar Fowler, Head of the Science Department, Central High School and Supervisor of Science, City Schools, Syracuse, New York Work‐Text Book in Physics, by A. W. Hurd Workbook to Accompany Introduction to Science by Otis William Caldwell, Professor of Education and Director of Institute of School Experimentation of Teachers College, Columbia University and Francis Day Curtis, associate Professor of Secondary Edueution and of the Teaching of Biology and General Science, University of Michigan, and Head of the Department of General Science and Biology in the University High School Workbook in Plane Geometry, by Hugh D. MacIntyre Exercises and Tests in Algebra Through Quadratics, by David Eugene Smith, William David Reeve and Edward Longworth Morss