112 THE PHYSIOLOGY OF REPRODUCTION 



those animals which experience an especially severe procestrum. 

 According to such a view as this the phenomena of menstruation 

 must be looked upon as belonging to the borderland of pathology. 

 In this connection the large number of leucocytes which attend 

 the menstrual process, some of them clearly phagocytic in 

 function, is not altogether unsuggestive. 



