I 



Modification of Germinal Constitution of Organisms 151 



YOUNG 5 PURE BLACK LINt AND SOURCE 

 or TRANSPLANTED OVARIES IN (J No 27 



r 



O DIED AND THEIR BLACK COAT- 

 ED FOETUSES WERE REMOVED 

 FROM HEP UTERUS 



Fig. 58. — To show the lack of effect of foster soma upon introduced ova. 

 (Modified from Castle.) Sec text for further discussion of this figure. 



