INTERNAL SECRETION OF TESTICLE 



117 





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Fig 



56. — Interstitial cells of different anitnals. Differential staining, 

 (A, B, C, E, F, Sudan and haematoxylin ; D, osmic acid and saffranin). 

 High magnification, A, adult mouse; B, adult guinea pig; C. 

 adult rabbit; D and E, adult cat in March; F' human embryo, 6 

 months old. In A, B, C, E, F vacuoles with or without lipoid 

 sickle-shaped bodies are visible ; in D the vacuoles are com- — 



pletely covered by fat. G, adult mouse. Vital staining of Goldmann ; 



the animal was treated during six weeks with " Pyrrholblau." The smaller, rather spindle-shaped cells 

 became blue, whereas the big epithelioid cells remained uncoloured. Possibly the smaller " pyrrholic " 

 mterstitial cells are in a different functional state from the big interstitial cells.— From Wagner. 



