234 



LOEB— CYCLIC CHANGES IN THE OVARY. [April 22, 



cycle in its essential aspects and they also make it extremely probable 

 that in a relative large proportion of mammalian animals a sponta- 

 neous parthenogenetic development of ova takes place at some period 

 during the life of the animal. 



Department of Pathology, 



Barnard Free Skin and Cancer Hospital, 

 St. Louis, Missouri. 



