112 INTERNAL SECRETIONS 



I shall give in this section a description of the interstitial 

 cells, based on observations made by myself and Dr. Wagner 

 on different species, especially on the rabbit, the guinea pig, the 

 mouse and the cat. The interstitial cells in the testicle of 

 mammals can be well recognised under normal circumstances 



m 

 «* 



9 i 

 4. 



G - 







Pf'^v 







e^ ? 













Fig. 52. — Section through testicle of normal rabbit, 14 

 months old (Prot. Nr. 82). x 280. — Prepar. of 

 Wagner; photo of Kull. 



by staining with haematoxylin and eosin ; the solution of Bouin 

 for fixation gives very good results; that of Helly (solution of 

 Miiller with subhmate and 5 per cent, formalin) is also very 

 useful. In the testicle of an adult rabbit or guinea pig Vv^e see 

 between the tubules triangular or quadrangular masses or cords 

 of cells very well stained by eosin {Figs. 51, 52). The spherical 

 nucleus is large and light coloured, the quantity of chromatin 



