HORMONES, DRUGS, AND TOXINS 



717 



he has obtained evidence that the " foster-mother " has an influence on the 

 offspring. He took hens of black and of white Leghorn varieties, which were 



;:v 7 ' I""" 1 ' -: , . 



c 



Fio. 255. GROWTH OF MAMMARY GLAND OF RABBIT CAUSED BY FORMATION OF CORPUS LUTEUM. 



A, Two glands of the virgin. 



B, Two glands, five days after coitus not resulting in fertilisation. 



C, Two glands of virgin rabbit, four days eighteen hours after appearance of corpora lutea, provoked by artificial 



rupture of the follicles with scissors. 



(Ancel et Bouin, 1911, Figs. 1, 2, and 3.) 



found to breed true, when mated with cocks of their own colour. The ovaries 

 were then interchanged. Subsequently they were mated with cocks of the 

 colour corresponding to the transplanted ovary, but opposite to their own colour. 



