THE TESTICLE AND THE OVARY 343 



P^zard 1 ol:)taine(l results on the whole similar, Init conchided that 

 ovariotomy had no influence (jn the development of the comb. 

 Moreover, the siclde and other characteristically male feathers did 

 not appear. The spayed lieu Pezard regards as Ijeing a neutral type 

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

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



Fill. 8.7). — iSucces.sive stages in the growth of the spui's of 

 a hen after ovaiiotomy : (left) six mouths after ; 

 (right) one yeai' after ; (bottom) two years after ; 

 (top) si.\ years after. (From Pezard.) 



could be inhildted and tlie )>ird Ix'come feminised, Goodale also lias 

 feminised a male 1iird l)y o\'arian traiisplantatinn fdllowing du 

 castration. 



Gocdale removed the ovaries from ducks and found tliat tlie 

 spayed female may or may not completely assume tlie perfect male 

 plumage. One bird after complete ovai-iotomy did not even assume 

 the eclipse plumage l)ut retained the nuptial p]\nnage of the drake. 



' Pezard, Aic eiJ. (see atiove, p. 334). 



