INTERNAL SECRETION OF OVARY 217 



that of the rabbit and that of the cow, ape and man. From his 

 observations made on the ovaries of 250 females of very different 

 species, Aschner concludes that the corpus luteum becomes 

 more and more dominant over the interstitial tissue, the 

 higher the position of the species in the class Mammalia. 







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

 rabbit., x 280. 



A. 2.^; weeks old (Prot. Nr. 54). No epithelioid cells between 

 the oocytes, the stroma consisting entirely of cells of 

 connective tissue. — ^Prepar. of Wagner; photo of Kull. 



Aschner's suggestion as to the parallehsm between fertihty 

 and quantity of interstitial tissue does not conform with what 

 Athias (1919, 1921) states about the Cheiroptera, in which 

 there is generally only one young produced yearly, and in 

 which there is, nevertheless, an abundant development of 

 interstitial tissue. 



