i6o INTERNAL SECRETIONS 



this fragment was calculated to be only about 20-25 nigr., 

 or about i per cent, of the weight of two normal testicles 

 (1921a, b, c; 1922 d). The sexual characters were fully 

 developed. Together with Miss Kropman, I made a similar 

 observation on the mouse (1922 k). This showed that the 



co^ 



Fig. 84. — Section through upper testuitl ay fragment 

 (guinea pig. Prot. Nr. 39). Same magniftcation 

 as Figs. 80 and 81. Operated at age of 3 weeks; 

 died at age of 3 J months. Fragment of 

 about the same volume as Figs. 79 and 80. 

 Backwardly developed (or infantile?) seminal 

 tubules. No increase of number or size of 

 interstitial cells. No signs of castration, but 

 development somewhat retarded. — Prepar. of 

 Wagner; design of Lehbert. 



hypertrophy of the testicle or of the seminiferous tubules after 

 unilateral castration is not a compensatory one. This view is 

 supported by the fact that in adult animals only a sHght hj^er- 

 trophy or no hypertrophy at all occurs after unilateral castra- 

 tion (Nothnagel, see Exner, 1903; Kyrle, 1911, p. 13; Lipschutz, 



