22 



INTERNAL SECRETIONS 



\ 



age at the time of castration is of great importance. A 



series of observations carried out with Bormann (1922) showed 



this very strikingly. In the corpora 

 cavernosa urethrae of the guinea 

 pig there is a bhnd sac on the 

 bottom of which two horny styles 

 may be seen ; in erection this blind 

 sac is turned back like a finger of 

 a glove {Fig. 10, Ab); the homy 

 styles are protruded and moved 

 rhythmically. I showed that the 

 horny styles may regenerate to a 

 certain degree in the normal 

 animal; if in an animal a year old 

 we cut away a horny style 5 or 

 6 mm. long, leaving only a Httle 

 stump of less than i mm., we shall 



observe a regeneration of the latter to a length of about 3 mm. 



If now we castrate a guinea pig with horny styles of about 



V 



Fig. II. — Penis of guinea pig 

 castrated at the age of 4^ 

 months, drawn 2 months later 

 (Phot. Nr. 27). Great quan- 

 tity of preputial secretion. 



Fig. 12. — Seminal vesicles of a normal guinea pig 1^ years oia 

 (Prot. Nr. 80). Nat. size. Below the vasa deferentia are 

 to be seen. 



5 mm. the latter diminish in a fev/ weeks forming finally 

 only thin stumps of about i to 2 mm. (Fig. 10, Bb). If the 



