304 INTERNAL SECRETIONS 



whereas removal of the ovary causes an increase of 17 to 30 

 per cent, above that of the normal females. So Moore (1919) 

 considered the possibility that the greater weight of the 

 masculinized guinea pig was caused rather by removing the 

 ovary than by engrafting the testicle. But new experiments 

 of Moore (1922) showed that his criticism was by no means 

 justified, as castrated female guinea pigs attained only the same 

 weight as normal ones. 



Steinach describes also differences in the coat of the normal 

 and masculinized females, claiming to have observed a trans- 

 formation of the fine and soft hair of the female into the coarse 

 and rough hair of the male. 



masculinized castrated normal normal 



female. female. female. male. 



Fig. 121. — Influence of testicular transplantation on size 0/ female guinea pig, 

 — From Steinach. 



The psycho-sexual behaviour of the masculinized female 

 guinea pig of Steinach was decidedly male. I had the oppor- 

 tunity of observing this animal under different conditions. 

 When a female on heat was put into its cage it behaved 

 towards the female like a normal male, and followed her about. 

 The characteristic call of the male was emitted. Moreover, 

 towards an ordinary male the masculinized female behaved 

 like a rival male and vigorously fought it. The psycho-sexual 

 behaviour of masculinized rats has been systematically studied 

 by Sand who attributed their behaviour to the engrafted 

 testicle. Moore also has described the psycho-sexual behaviour 

 of masculinized guinea pigs, and his observations fully corrobo- 

 rate those described above. In view of all this it is clear that 



