THE COUKSE OF BIOLOGIC EVOLUTION. •>•> 



organic evolution, appear to us erratic or even spasmodic. 

 Nevertheless its potency is far greater and the ends attained 

 through it are upon the whole the same. It owes this charac- 

 ter to the fact that it is a psychic force as distinguished from 

 either physical or vital forces. Its study is therefore a part of 

 psychology, and from it we should learn that psychology is 

 simply a branch of biology and its study should begin with 

 animals and not with man. Finally, the peculiar character of 

 this psychic influence is due to its being a product of higher 

 organization. Mind is to biology what protoplasm is to chem- 

 istry. Psychology is transcendental biology.* 



"'•" So called by Auguste Conite, who refused to recognize it as a distinct 

 science. See his Philosophic Positive, Vol. IV, p. 342. 



