THE TESTICLE AND THE OVARY 343 



Pe*zard l obtained results on the whole similar, but concluded that 

 ovariotomy had no influence on the development of the comb. 

 Moreover, the. sickle and other characteristically male feathers did 

 not appear. The spayed hen Pt'zard regards as being a neutral type 

 like the castrated cock (see above, p. 334). By transplanting 

 ovarian tissue on to a castrated male the growth of the spurs, etc., 



FIG. 85. Successive stages in the growth of the spurs of 

 a hen after ovariotomy : (left) six months after ; 

 (right) one year after ; (bottom) two years after ; 



(top) six years after. (From IV/.ard.) 



could b^ 1 inhibited and the bird become feminised. Goodale also has 

 feminised a male bird by ovarian transplantation following on 

 castration. 



Gocdale removed the ovaries from ducks and found that the 

 spayed female may or may not completely assume the perfect male 

 plumage. One bird after complete ovariotomy did not even assume 

 the eclipse plumage but retained the nuptial plumage of the drake. 



1 P6zard, foe. at. (see above, p. 334). 



