SCIENCE— ADVERTISEMENTS 



A Text- Book of Physics Revised Edwon 



By L. B. Spinney, Professor of Physics at Iowa State College. Cloth, Octavo, 

 about 62s pages. To be ready in September. 



In revising this book the author has aimed primarily to increase its teachability and to 

 make the discussions clearer. Among the important changes are : a rearrangement of the 

 chapters on electricity, the introduction of recent investigations concerning X-rays, an ampli- 

 fied consideration of Newton's laws, the use of both the ray and wave front in diagrams 

 for reflection of light, and a description of the vacuum tube with its application in radio- 

 telegraphy and radiotelephony. New problems have been provided throughout the book. 



Plane Trigonometry 



By John W. Young and Frank M. Morgan, Professors of Mathematics at Dart- 

 mouth College. Cloth, i2mo, 122 pages, $1.50. 



This new Plane Trigonometry emphasizes the numerical aspects and applications of the 

 subject. It embodies the characteristic features of the widely approved sections devoted to 

 trigonometry in the authors' earlier work, " Elementary Matematical Analysis." 



Logarithmic and Trigonometric Tables eSTtlifn 



Prepared under the direction of Earle R. Hedrick, Professor of Mathematics in 

 the University of Missouri. Cloth, i2mo. To be ready in September. 



This revised edition of the widely used " Macmillan Tables " contains several tables not 

 included in the earlier book. New tables are added to complete the tables of hyperbolic 

 functions ; a table of haversines will be welcomed by those interested in navigation ; tables 

 of factors of composite numbers, logarithms of primes, compound interest, annuities, depre- 

 ciation, etc., are among the new sections. 



Vertebrate Zoology 



By Horatio H. Newman, Professor of Zoology and Embryology in the University 

 of Chicago. Cloth, Octavo, 432 pages, $3.00. 



This volume is intended for use as a textbook in college courses in vertebrate zoology 

 and comparative anatomy. Professor Newman approaches his subject from the dynamic 

 rather than structural point of view ; thus the physiological, phylogenetic, ecological and 

 evolutionary aspects of vertebrates are particularly emphasized. Careful attention is given 

 to the anatomical facts and data of extant species of animals, but the forms are placed in 

 their setting and viewed as modern end-products of the evolutionary process. 



Essentials of Psychology Revised Edition 



By W. B. Pillsbury, Professor of Psychology in the University of Michigan. 

 Cloth, i2mo, 428 pages, $1.90. 



In preparing this revised edition the book has been entirely reset. The chapter on 

 Emotion has been largely rewritten, the chapter on Memory has been expanded, there is a 

 new chapter on Types of Mind, dealing with some of the more general results of mental 

 testing; and numerous minor changes have been made in every chapter. At various points 

 in the book reference is made to the theories and research of Freud, Pawlaw, Watson, and 

 other important psychologists whose influence has been most marked in recent years. The 

 questions and exercises at the end of chapters have been revised and improved. 



THE MACMILLAN COMPANY 



PUBLISHERS NEW YORK 



