CONTENTS 



Page 

 The Unity of Science, by Arthur O. Lovejoy . . 1 



Mathematics, by Earl R. Hedrick .... 37 



Physics, by Oscar Milton Stewart .... 57 



Chemistry, by William George Brown . . . .79 



Astronomy, by Herbert Meredith Reese . . . 105 



Geology, by Curtis Fletcher Marbut . . . 125 



Botany, by C. Stuart Gager 149 



Experimental Zoology, by Winterton C. Curtis . .177 



Evolutional Zoology, by George Lefevre . . . 205 



