AcQuiiUED Modifications Heritable? 121 



out. The striking biblical passage seems sig- 

 nificantly true in this connection. 



questions 



1. Can you give examples of acquired modifications 

 not mentioned in the book ? 



2. Will you give some examples of the apparent 

 transmission of acquired modifications that are other- 

 wise explicable ? 



3. Recall Tower's experiments with potato beetles, 

 and then make clear the distinction between the influ- 

 ence of an environmental factor upon the body plasm 

 and upon the germ plasm. 



4. What is the evidence that it is possible for alcohol 

 to directly injure the germ cells and so produce deteri- 

 oration in the offspring ? 



5. In what way is it possible for the "sins of the 

 fathers" to be visited upon the "children to the third 

 and fourth generation" ? 



