The University of Chicago 

 School Science Series 



By ELLIOT R. DOWNING 

 Our Living World 



A Source Book of Biological Nature-Study 



A Field and Laboratory Quide in Biological Mature- 

 Study 



Our Physical World 



A Source Book of Physical Nature-Study 



A Field and Laboratory Quide in Physical Nature- 

 Study 



A Naturalist in the Qreat Lakes Region 

 Teaching Science in the Schools 



By W. L. EIKENBERRY 

 The Teaching of Qeneral Science 



THE UNIVERSITY OF CHICAGO PRESS 



CHICAGO , ILLINOIS 



