LD SCIENCE SERIES 



Edited by John W. Ritchie 



COMMON SCIENCE 



by 



Carleton W* Washburne 



> i 



Superintendent of Schools, Winnetka y Illinois 



Formerly Super-visor in Physical Sciences and 



Instructor in Educational Psychology 



State Normal School 

 San Francisco^ California 



ILLUSTRATED 



WITH PHOTOGRAPHS AND 

 DRAWINGS 



Yonkers-on-Hudson^ New York 



WORLD BOOK COMPANY 



re /?30^ 



