88 WHAT EVOLUTION IS 



But even though mutilations have 

 no effective influence on the germ 

 cells of the animals suffering from 

 such defects, may not bodily activi- 

 ties, more normal in character than 

 mutilations, influence the germinal 

 elements? May not a normal but 

 novel and unusual condition of the 

 body cells influence the contained 

 germ cells? To test this Castle and 

 Phillips attempted the very ingenious 

 experiment of transferring germ cells 

 from one individual, with a given set 

 of bodily traits, to another individual, 

 with very different traits, and of test- 

 ing the results of such a transfer by 

 breeding. They proceeded in the fol- 

 lowing way. The ovaries W'Cre re- 

 moved from a young guinea pig of 

 pure white stock and in their place 

 were set the ovaries from a pure 

 black individual. After recoverv 

 from the operation, this white female 



