I'LATE 3 



Fig. 9. Pliiristralificd epithelium of the eiulonietiiuni of the uterine horn of 

 a guinea pig which has received 129 injections of 20 /xg. of estradiol given as 

 3-ben2oate in the course of 335 days. Note absence of cornification. To be com- 

 pared with figure 1. X 145. (I, 21; same series as fig. 3.) 



Figs. 10 and 1 1. Nodular local increase of interstitial tissue in a testicular frag- 

 ment. Fig. 10. Fragment of the upper pole of the right testicle of the guinea pig 

 130 days after removal of the left end of the greater part of the right testicle, the 

 fragment of the latter being sho^vn. The fragment is surrounded by the fatty 

 body of the testicle. Parts of the head of the epididymis and plexus pampini- 

 formis are also visible. The fragment \\eighed about 20 mg. or 5 per cent of the 

 normal weight of the two testicles. Seminiferous tubules in a state of far-going 

 degeneration. X 14. Fig. 11. Part of interstitial-tissue nodule at higher magnifi- 

 cation. Note the variation of nuclear size of interstitial cells which are mostly 

 hypertrophied. x 176. (D. 30.) 



[3'2] 



