80 



SEXUAL DIMORPHISM 



in the Cervidre, on the other hand, when the rutting season 

 came and fighting commenced, or even before that time, 



Fig. 4. A, Antler of a Stag, probably a young Red Deer, to show the grooved surface, 

 the burr, and the relation to. the skull. B, A similar antler cut through the middle 

 longitudinally to show the internal structure. From specimens in the British 

 Museum of Natural History. 



when the animal rubbed its horns against trees in conse- 

 quence of the irritation felt in them, the vascular skin and 



