342 



HEREDITY AND ENVIRONMENT 



fowls and concluded that there was some in- 

 fluence of the foster mother upon the trans- 

 planted ovary, but Davenport, who repeated 

 his experiments, was unable to confirm his re- 

 sults. Finally Castle and Phillips furnished 

 the most conclusive demonstration that the 



FIG. 80. Grafted frog embryos, anterior part, Rana syl- 

 vatica, posterior part, R. palustris. In later stages, and even 

 in the adult condition, the two parts preserve their peculiari- 

 ties. (From Harrison.) 



