2l8 



INTERNAL SECRETIONS 



According to Winiwarter, the interstitial tissue is present 

 in all mammals, which differ only in regard to the quantity 

 of this tissue. "As far as I know there is no species," he says 

 (quoted from Athias, 1921) "where it (this tissue) is wholly 

 absent." The contradictory data, so noticeable in the papers 





V-rli 



Fig. 99. — Development of interstitial tissue of the ovary in rabbit. 



X 280. 

 B. 7 months old (Prot. Nr. 1 18). The stroma consists of small 

 epithehoid cells. Two corpora albicantia are to be seen 

 surrounded by interstitial cells. — ^Prepar. of Wagner; 

 photo of Kull. 



on the subject, and even in recent ones, he explains as due to 

 the researches being very incomplete. Sainmont and Wini- 

 warter consider the interstitial cells as nutritive organs. It 

 may be emphasized again that interstitial cells have been 

 stated by the different authors to be present in the ovary of the 



