356 



THE HORSE 



shed ; and also the relation of the width to the length of the 

 top corner teeth ; and whether the inside walls of the lower 

 corner teeth are level with the outsides or not, if the horse 

 is represented to be 6 years old. 



The cups leave the crowns in this order : — 



Cups disappear from- 

 Centrals at 

 Middles at 

 Corners at 



Age. 



7 years 



8 years 



9 years 



PLATE XX. 



Loioer Jaiv at 7 years. 



Cups entirely left the centrals. Cups small in the middles. Inside wall 

 of corner teeth begins to show wear, and the outside wall is thicker. 



At 6 years the top corner teeth are only a little wider 

 than they are long ; and the inside walls of the lower corner 

 teeth are level with the outside walls, which are thicker 

 than at 5 years (Plate XIX.). 



At 7 years the upper corner teeth are square, or longer 

 than wide ; and the inner walls of the lower corner teeth 

 begin to show signs of wear, and have ceased to be very 

 thin (Plate XX.). 



