I20 INTERNAL SECRETIONS 



Alfred Kohn (1914 a) summarises our knowledge in this field 

 in the following terms: ''The interstitial cells of the generative 

 glands are certainly not common connective tissue cells. The 

 interstitial tissue is not a connective one like the connective 

 tissue which is to be found everywhere in all organs and which, 





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V. 



Fig. 57c. — Development of interstitial tissue in guinea pig. 

 Six days old (Prot. Nr. 71). 



indeed, is present also in the generative glands. The inter- 

 stitial cells are elements which are confined to the generative 

 glands, and they are no less peculiar and specific than the 

 epithelial generative cells themselves. How is this to be 

 explained? The most likely explanation seems to he in the 

 suggestion that they are autochthonic elements formed on the 

 spot and originating from the same primitive tissue as the 



