WORLD BOOK COMPANY 



THE HOUSE OF APPLIED KNOWLEDGE 

 Established, 1905, by Caspar W. Hodgson 



URS-ON-Hl DSON, NKW YORK 

 2126 I'KAIKIK AVENUE, C'HI 



One of the results of the World War has 

 been a widespread desire to see the forces 

 of science which proved so mighty in de- 

 struction employed generally and systemat- 

 ically for the promotion of human welfare. 

 World Book Company, whose motto is The 

 Application of the \Vorld's Knowledge to the 

 World's Needs, has been much in sympathy 

 with the movement to make science an 

 integral part of our elementary education, 

 so that all our people from the highest to 

 the lowest will be able to use it for them- 

 selves and to appreciate the possibilities of 

 ameliorating the conditions of human life by 

 its application to the problems that confront 

 us. \Ve count it" our good fortune, there- 

 fore, that we are able at this time to offer 

 Common Science to the schools. It is one 

 of the new type of texts that are built on 

 educational research and not by guess, and 

 we believe it to be a substantial contribution 

 to the teaching of the subject 



NWSS:WCS-I 



Copyright, 1920, by World Book Company 



Copyright in Great Britain 



All rights reserve J 



