BOOK REVIEWS

Book reviewed in this article: Outlines of Geology, by Chester R. Longwell. Henry Barnard Davis Professor of Geology in Vale University , Adolph Knopf, Sterling Professor of Physical Geology in Yale University , Richard F, Flint, Associate Professor of Geology in Yale University , Charles Schubert, Professor Emeritus of Paleontology in Yale University , and Carl O. Dunbar, Professor of Paleontology and Stratigraphy in Yale University . Eye Hazards in Industry, by Louis Resnick, Coauthor Community Hygiene, by Dean Franklin Smiley, Professor of Hygiene Cornell University , and Adrian Gordon Gould, Assistant Professor of Hygiene, Cornell University . Natural History and the American Mind, by William Martin Small‐wood, Chairman, Department of Zoology, Syracuse University in collaboration with Mabel Sarah Coon Smallwood. Current Practices in Institutional Teacher Placement, written by thirty‐five members of the National Institutional Teacher Placement Association. Editorial Committee: Earl W. Anderson, Ohio State University ; John Douglas Leith, Teachers College, Columbia University ; and Ralph F. Strobel, Chairman, Syracuse University . Engineering Drawing, by D. E. Hobart Economic Geography, by Clarence F. Jones, Professor of Geography, Clark University ; in collaboration with Gordon G. Darkenwald, Instructor in Geography, Hunter College of the City of New York Clouds, Air and Wind, by Eric Sloane. Mathematics for the Aviation Trades, by James Naidich Matter, Energy and Radiation, by J. R. Dunning, Associate Professor of Physics, Columbia University , and H. C. Paxton, Instructor in Physics, Columbia University . This Physical World, by C. C. Clark, Associate Professor of General Science, New York University ; C. A. Johnson, Instructor in General Science, New York University ; and L. M. Cockaday, Lieul. Comdr., U. S. N., Military Instructor in Physics, United States Naval Academy . Experimental Foundations of General Psychology, by Willard L. Valentine, Professor of Psychology, Northwestern University . First Year College Mathematics, by Cleon C. Richtmeyer and Judson W. Foust, Central Michigan College of Education . What is Truth? by Glen Hilding Draper, Trustee, Research Institute Washington, D. C.; Associate‐Astronomer, Mathematician of the United States Naval Observatory . Simple Chemical Experiments, by Alfred Morgan The Flower Family Album, by Helen Field Fischer, Radio Garden Consultant and Gretchen Fischer Harshbarger, Landscape Architect and Horticultural Illustrator . Material Facilities, Needed in the Training of Intermediate Grade Teachers in Science, by H. A. Cunningham, Ph.D. Second‐Year Algebra, by Raleigh Schloring, Head of Department of Mathematics, The University High School, and Professor of Education, University of Michigan ; Rolland R. Smith, Specialist in Mathematics, Public Schools, Springfield, Massachusetts ; with the co‐operation of John R. Clark, Teachers College, Columbia University . A First Course in Trigonometry, by W. J. Oliver, Central Collegiate Institute, Regina, Saskatchewan ; P. F. Winters, Scott Collegiate Institute, Regina, Saskatchewan ; and J. E. Campbell, Central Collegiate Institute, Regina, Saskatchewan . The Philosophy of Alfred North Whitehead, Edited by Paul Arthur Schilpp, Northwestern University . Algebraic Solid Geometry, by S. L. Green The Foundations of Conservation Education, by Henry B. Ward (editor) et al. The Microbe's Challenge, by Frederick Eberson, Ph.D., M.D. Workingwith the Microscope, by Julian D. Corrington, Ph.D. The Teaching of Secondary Mathematics, by Charles H. Butler, Department of Mathematics, Western Michigan College of Education , and F. Lynwood Wren, Julia A. Sears, Professor of Mathematics, George Peabody College for Teachers Physical Science, by Charles H. Neltels, Paul F. Devine, Walter F. Nourse, and M. E. Herriott of Los Angeles City Schools .