MODERN SCIENCE PROBLEMS 



A TEXTBOOK IN GENERAL SCIENCE 



BY 

 ELLSWORTH S. OBOURN, B.S. 



HEAD OF THE SCIENCE DEPARTMENT 



JOHN BURROUGHS SCHOOL 



CLAYTON, MISSOURI 



AND 

 ELWOOD D. HEISS, PH.D. 



HEAD OF THE SCIENCE DEPARTMENT 



STATE TEACHERS COLLEGE 



EAST STROUDSBURG, PA. 



WEBSTER PUBLISHING COMPANY 



1808 WASHINGTON AVENUE ST. LOUIS, MISSOURI 



