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KEW 

 Cretaceous and Cenozoic Echinoidea 

 of the Pacific Coast 



133 Pages, 40 Plates, Paper $2.50 



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 Revision of the Avian Genus 

 Passerella 



149 Pages Paper $1.75 



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 Plankton of the San Joaquin 

 River 



292 Pages Paper $3.00 



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The University of California Press 



Berkeley, California 19 Ea>t 47th Street, New York 



Second Revised Edition 



McPherson and Henderson 



General Chemistry 



A thorough revision of this 

 standard textbook to include 

 the many recent develop- 

 ments of the science in war- 

 fare and in the industries. 

 New illustrations and dia- 

 grams add to its effective- 

 ness. For colleges, normal 

 schools, and technical high 

 school. 



GINN AND COMPANY 

 70 Fifth Avenue, New York 



A New Physics Text-book for Students of Agriculture, 

 Engineering and General Science 



GENERAL PHYSICS 



And Its Application to Industry and Everyday Life 

 By ERVIN S. FERRY 



Professor of Physics in Purdue University 



DESIGNED for those students who, in the early part of their college career, 

 require a coordinated elementary course in the fundamental principles, 

 the methods, and industrial applications of physics, this book fills its 

 purpose admirably. In addition to imparting information, it also gives training 

 in the methods by which facts are connected by laws and these laws are applied 

 to the affairs of everyday life. 



Ferry's "GENERAL PHYSICS" has 737 pages, si by 8, 687 problems and 

 600 figures. It is bound in cloth. 



Send TODAY for a Free Examination copy of FERRY'S "GENERAL 

 PHYSICS"; it will be ready July 15th. 



JOHN WILEY & SONS, Inc. 



432 Fourth Avenue 



NEW YORK 



