86 



GENETICS 



independent organism ; what it takes up serves as food ; 

 this is not incorporated merely in the growing organ- 

 ism, it is made over into the same kind of living sub- 

 stance as composes the assimilating organism." 



FIG. 12. Diagram of ovarian transplantation experiment to 

 show the influence of somatoplasm upon germplasm. Black 

 is dominant over albino. The ovaries from a black guinea-pig 

 were engrafted into a female albino whose ovaries had been 

 removed. Upon recovery this female was crossed three times 

 with an albino male. All the progeny were black. Data from 

 Castle and Phillips. 



12. ACQUIRED CHARACTERS IN THE PROTOZOA 



Although the problem of the inheritance of acquired 

 characters is much better defined among the higher ani- 



