BOOK REVIEWS

Book reviewed in this article: D irected E xperiments in B iology , by Jack Robbins, Head of the Biology Department, Rhodes School, New York City ; and Alan Wayne, Science Instructor, New York City High Schools . Edited by J. B. Marks, Science Department, Sharon High School, Sharon Pa . A dvanced M athematics for E ngineers , by H. W. Reddick, Adjunct Professor of Mathematics, New York University, University Heights ; and F. H. Miller, Professor and Head of the Department of Mathematics, The Cooper Union School of Engineering . Second Edition. M usical A coustics , by Charles A. Culver, Ph.D., Formerly Head of the Department of Physics, Carlcton College . Second Edition. R elativity the S pecial and G eneral T heory , by Albert Einstein, Ph.D., Professor of Physics in the University of Berlin . Translated by Robert W. Law‐son, D.Sc., F. Inst. P., University of Sheffield . C ollege P hysics , by Arthur L. Foley, Revised by J. L. Glathart, Ph.D., Professor of Physics and Chairman of the Department, Albion College, Michigan. Fourth Edition.