SCIENCE— ADVERTISEMENTS 



THE 

 PRINCIPLES OF 

 STRATIGRAPHY 



BY 

 AMADEUS W. GRABAU, S.M., S.D. 



PROFESSOR OF PALEONTOLOGY IN 

 COLUMBIA UNIVERSITY 



"Should be on the reference shelf of every col- 

 lege, normal school, and large high school in the 

 United States." — Journal of Geography, Vol. XI 11. 

 Jan. 1915. 



8eo, JISO pages, 264 illattrationt. Pric; $7. BO 



Descriptive Circular Sent upon Request 



A. G. SEILER & CO. 



NEW YORK CITY 



Mechanics, Molecular 

 Physics, and Heat 



By RoBEET A. MiLLiKAN, University 

 of Chicago. $1.50. 



Electricity, Sound and Light 



By Robert A. Millikan, University 

 of Chicago, and John Mills, Colorado 

 College. $2.00. 



A remarkably successful one-year course 

 in college physics. The books are at the 

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Each chapter deals with some important 

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 and problems. 



Ginn and Company 



Boston New York Chicago London 

 Atlanta Dallas Columbus San Francisco 



An Outline of Psychobiology 



By KNIGHT DUNLAP 



Professor of Experimental Psychology in The Johns Hopkins University 



Second Edition, with Glossary 

 Royal Octavo, 145 pages and 84 illustrations. Cloth, $2.00 



This book, originally intended to aid students of psychology to acquire the 

 necessary biological foundations for the understanding of modern psychological theories 

 and results, has not only fulfilled its purposes in a gratifying way, but has proved a use- 

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The aim of the book is to make clear the elementary facts of structure and function 

 involved in reaction, especially the reactions which underhe consciousness. It takes 

 into account therefore not merely gross and histological details of the nervous system, 

 but also details concerning muscles and glands, without such consideration modern 

 psychological conclusions Eu-e not intelligible. 



Emphasis is placed on the technical biological terms relating to the reactive mech- 

 anism, thus greatly assisting the student who wishes to read the standard texts and 

 periodical Uterature in human psychology. 



THE JOHNS HOPKINS PRESS 



BALTIMORE, MARYLAND 



