114 



INTERNAL SECRETIONS 



Wagner showed that these spaces are often filled with a homo- 

 geneous or granular mass, and as this phenomenon could be 

 observed after fixation Hkewise in formaHn and in the solutions 

 of Flemming, Bouin and Helly, it seems very probable that 

 these spaces are not artificial, but have something to do with 

 the function of certain parts of the testicle. 



^% 



'<^I% 

 .#*? '#»1 









■1 



*^a^9 







^iS^ Til ly^?.-* '» ^ 



Fig. 54. — Section through testicle of man 26 years old 

 (executed). Haematox.-eosin. Complete sperma- 

 togenesis; well developed interstitial cells. — From a 

 preparation kindly lent by Aunap; design, Lehbert. 



By differential stains inclusions may be observed in the 

 protoplasm of the interstitial cells. There has been much 

 discussion about the fatty granules in these cells ; such granules 

 are, indeed, to be found generally in the interstitial cells. 

 Some authors are inclined to consider them as the most 

 characteristic feature. But on staining preparations of an 

 adult rabbit or mouse with "Sudan," one can see that the 



