328 Relation of Use and Disuse to Evolution 



organism cannot be ascribed as due exclusively to inheritance 

 or exclusively to the environment. 



3. Developed characters are never transmitted as such 

 in heredity. 



4. The general constitution is not changed by the de- 

 velopment of characters in the individual. 



5. Germ cells may be influenced by environmental 

 factors acting throtigh the body, but are not influenced by 

 the reactions of the soma to the same environmental factors 

 — or at least not in the sense of including a similar develop- 

 ment in subsequent generations. 



