Relatio7i betweeti Estriim, Ovulatioji, Fertilization, etc. iij 



animals where menstruation occurred, it is indicated by +, while, 

 in those in which no sanious discharge could be recognized, the 

 fact is indicated by — . 



Relationship between Estrum, Ovulation, Fertil- 

 ization AND Menstruation. 



