552 UPPER JAW, " FILLING UP" SLOW. [BOOK IV. 



grooves inside, that may be felt with the ringer, 

 and seen as represented in the figure annexed. At 

 this age the two front teeth give proof of being 

 worn, principally on the outer edge ; the wearing 

 away goes on, and at six years the surface is level, 

 or as they say " the mark is gone," whilst the next 

 two teeth also begin to wear. Now, also, the 

 grooves just spoken of in the corner teeth fill up ; 

 the curve in the tushes is diminished, and at 

 seven years their grooves fill up in like manner, and 

 become conVexed in another year or two. Up to 



this age only the two 

 corner teeth retain 

 the mark, and that 

 but slightly ; when 

 the horse acquires the 

 term " aged, " and 

 these two, likewise, 

 soon after become 



7 years. smooth. 



This is the state of the lower jaw at seven years 

 old, but the teeth of the upper jaw do not fill up 

 so fast by two years ; so that a tolerably shrewd 

 guess at the age of a horse may be formed until it is 

 twelve. The marks in the two front teeth of the 

 upper jaw are not obliterated until eight years old, 

 and the next two become smooth only at the tenth 

 year of its age ; being each two years later than 

 happens to the corresponding teeth of the lower 

 jaw ; whilst the two corner teeth above do not lose 

 their marks until the twelfth vear. 





