RESULTS OF CASTRATION 



21 



really depends on the testicle; it never attains the same size 

 after prepuberal castration as it does during normal postpuberal 

 development, for in the normal animal it continues to grow 

 for more than a year after the attainment of puberty at an 

 age of about 2^ months. The influence exerted by the testicle 



Aa 



Ab 



Ba 



Bb 





Ca 



Cb 



E 



P 





Fig. le- 

 ases. 

 sac. 

 A. 

 B. 



C. 



-The penis and intromittent sac of guinea pig, castrated at different 

 Nat. size. Aa, Ba, Ca, D, E = penis. Ab, Bb, Cb= intromittent 



Normal, 12 months old. 



Castrated at 6 months, drawn at 12 months (Prot. Nr. 25). Penis 



shorter. Mucosa of intromittent sac ^smooth; homy styles 



very shortened. 

 Castrated at i^ months, drawn 7^ months later (Prot. Nr. 15). 



Penis shorter than in B; homy styles invisible. 

 Castrated at ^ month, drawn 6 J months later (Prot. Nr. 23). Penis 



very short, but more developed than the juvenile penis (E). 

 Normal penis at age of J month. 



before castration may suffice in some instances to maintain 

 the growth for a certain time after prepuberal removal of both 

 testicles, contrary to what we see with the vesiculae seminales, 

 or to what Marshall observed with the horns of sheep, which 

 also stop their growth immediately after castration. The 



D. 



E. 



