INTERNAL SECRETION OF TESTICLE iii 



wholly embedded when the quantity of this cellular mass is 

 greater. The principal part of this mass consists of corpuscles 

 of fatty appearance which do not .change in acetic acid and in 

 caustic soda, and which are colourless or yellowish." (See also 

 Leydig, 1857, p. 495.) Since Leydig a great number of papers 



Fig '^iB— Section through testicle of normal guinea pig, a ^ed 

 about ,h months. (Prot. Nr. 27). ^ ^^.-' .^^'Z^^^f, 

 cells, capillaries and granulated mass m mtertubular 

 space.-^Prepar. of Wagner; photo of Kuli. 



have been pubhshed on the histology of the interstitial cells. 

 The most important paper of this kind dealing with the history 

 of this question is that of Bouin and Ancel (1903 a). i^e 

 papers of Bonng and Pearl (1917). Waldeyer (1921), and 

 Benda (1921) may also be referred to. ^ 



