WORLD BOOK COMPANY 



THE HOUSE OF APPLIED KNOWLEDGE 



Established, 1905, by Caspar W. Hodgson 



yonkees-on-hudson, new york 



2126 Prairie Avenue, Chicago 



The need for education in the principles of 

 conservation is imperative. As Henry Fair- 

 field Osborn states the matter, " We are yet 

 far from the point where the momentum of 

 conservation is strong enough to arrest and 

 roll back the tide of destruction." The 

 movement for the preservation of natural 

 resources can succeed only with the estab- 

 lishment of an enlightened public sentiment 

 on the subject. To create and maintain such 

 a sentiment is the proper work of the schools. 

 In making this Conservation Header avail- 

 able for school use, author and publishers 

 have had in mind the great and lasting ser- 

 vice that such a text might render. The 

 publishers believe that this little volume and 

 others forthcoming in the Conservation 

 Series will rank high among " Books That 

 Apply the World's Knowledge to the World's 

 Needs " 



.@ Itl 



Copyright, 1920, by World Book Company 



Copyright in Great Britain 



All rights reserved 



