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The groove alluded to will be found on the corner tooth of the 

 upper jaw, running down the middle of the tooth. When a 

 horse is from fourteen days to six years old, I judge by the 

 appearance of both jaws; when from six to ten years, by the 

 lower jaw, and when from ten to twenty-one years, by the groove 

 in the upper jaw. The above is the only true system in the 

 world, to my knowledge, for telling a horse's age. 



Gleason's Practical Illustrations of the Age of the 



Horse. 



Tlie FoaPs Jaw at Blrtb* 



