3o8 INTERNAL SECRETIONS 



male feather characters" was seen. The bird was killed a year 

 after the operation ; ovarian tissue was found in the abdominal 

 cavity in different positions. No oviduct and no vasa deferentia 

 were detected. 



Later on Goodale (1918) described further experiments with 

 successfully feminized cocks. The results were similar to those 

 described above. There were, however, differences in the con- 

 dition of the various individuals. Goodale points out that in 

 the second series of experiments the spurs were well developed, 

 whereas the bird mentioned above showed an inhibition, 

 though not a complete one, of the growth of the spurs. The 



Fig. 122. — Feminized cockerel. Female plumage. — 

 From a photo kindly lent by Goodale. 



body-size resembled that of the male. The psycho-sexual 

 behaviour was in some of the experimental birds more or 

 less like that of a normal cock, whereas in others no sexual 

 instincts were to.be observed. On the contrary, the comb, 

 wattles and plumage became indistinguishable from that of a 

 female. 



In discussing the results of these experiments Goodale deals 

 with three different possibilities: (i) that the portion of the 

 ovar}/ which survived the implantation was not sufficient to 

 control the sex characters entirely; (2) that there was a 

 different genetic basis in each bird, so that each individual 

 reacted differently to similar hormones; (3) that a portion of 



