FACTS AND FACTORS OF DEVELOPMENT 47 



simplest protoplasm we find organization, that 

 is, structure and function, and in germinal 

 protoplasm we find the elements of the mind 

 as well as of the body, and the problem of the 

 ultimate relation of the two is the same 

 whether we consider the organism in its germi- 

 nal or in its adult stage. 



In some way the mind as well as the body 

 develops out of the germ. What are the 

 germinal bases of mind? What are the psy- 

 chical Anlagen in embryos and how do they 

 develop? In this case, even more than in the 

 development of the body, we are compelled to 

 rely upon the comparison of human develop- 

 ment with that of other animals, but the great 

 principle of the oneness of life, as respects its 

 fundamental processes, has never yet failed 

 to hold true and will not fail us here. In the 

 study of the psychical processes of organisms 

 other than ourselves we are compelled to rely 

 upon a study of their activities, their reactions 

 to stimuli, since we can not approach the sub- 

 ject in any other way. The reactions and be- 

 havior of organisms under normal and experi- 

 mental conditions give the only insight which 



