132 



INTERNAL SECRETIONS 



Fig. 63. — Testicle of adult guinea pig, 

 about 18 months old. The animal 

 died of tuberculosis and was very 

 thin. The fatty body disappeared, 

 and the relations between testicle 

 and epididymis become apparent. 

 To be compared with Fig. 64. 



Fig. 64. — Diagram of different operations performed in the Physiological 

 Institute on the testicle of mammal. Black: part of the testicle left in the 

 body; white: part removed. I., upper partial castration (one testicle 

 removed, from the other an upper fragment left); II., under partial 

 castration; III., horizontal incisions not touching the epididymis; 

 IV., horizontal incision, by which an upper fragment is formed without 

 the total testicular mass being reduced; V., horizontal incision near 

 the under pole of the testicle by which almost the whole testicle is trans- 

 formed into an upper fragment. 



