46 HEREDITY AND ENVIRONMENT 



fail to recognize the essential unity of the en- 

 tire organism, structure as well as function; 

 that neither of these is the cause of the other, 

 though each may modify or condition the other, 

 but that they are two aspects of one common 

 thing, viz., organization. In the same way I 

 think that the body or brain is not the cause 

 of mind, nor mind the cause of body or brain, 

 but that both are inherent in one common or- 

 ganization or individuality. 



In asserting that the mind develops from 

 the germ as the body does, no attempt is made 

 to explain the fundamental properties of body 

 or mind. As the structures of the body may 

 be traced back to certain fundamental struc- 

 tures of the germ cell, so the characteristics of 

 the mind may be traced back to certain funda- 

 mental properties and activities of the germ. 

 Many of the psychical processes may be traced 

 back in their development to properties of 

 sensitivity, reflex motions, and persistence of 

 the effects of stimuli. All organisms manifest 

 these properties and for aught we know to 

 the contrary they may be original and neces- 

 sary characteristics of living things. In the 



