INTERNAL SECRETION OF OVARY 219 



cat, guinea pig, rat, mouse, bat, mole, hedgehog, horse, sheep 

 and goat. Lately, Athias (1919) investigated in a very detailed 

 way the question of the interstitial tissue in the ovary of the 

 bat, where this tissue occupies a large space in the ovary. 

 Athias gave also a very thorough description of the cytological 



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- . TV' J~ f 'T 





Fig. 99. — Development of interstitial tissue oj the ovary in rabbit, x 280. 

 C. 18 months old (Prot. Nr. 44). The epithelioid cells with 

 very rich protoplasm and big spherical nucleus. — Prepar. 

 of Wagner; photo of Kull. 



character of this tissue, the structure of which he declares to be 

 that of an endocrine gland. The interstitial cells show the 

 attributes of glandular elements. Athias considers the fatty 

 inclusions of the protoplasm as secretory products. But he 

 thinks that the secretion undergoes some chemical change 

 before leaving the cells, since no substance of a Hpoid character 



