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51. At eight years off, the gum of the lower corner 

 tooth has become square, and the lower tush blunt. 

 The original drawing was made from the teeth of 

 that noted horse, Oakley ; and in order to render 

 it as perfect as possible, the mouths of mares 

 (Meal, Edgworth, Bess, &c.) have been compared. 

 The departure from the circular form of the gum, as 

 depicted in the coloured engraving, is even more 

 marked than it was at the seventh year. Added 

 to this change of figure, the gums appear more 

 hard and less delicate ; the mouth looks more firm, 

 and seems to have attained the perfection of its 

 strength. The margin of the lower jaw is now 

 comparatively sharp, and tlie cheeks are flat. The 

 crusta petrosa on the upper teeth is in a great degree 

 removed ; the enamel not yet, however, having a 

 marked yellow tinge. On the lower corner incisors 

 the crusta petrosa may still continue, but it no 

 longer has a dull brown aspect : it is never promi- 

 nent at this age, but rather speckled over the outer 

 surface, than regularly enveloping any portion of 

 it. It has a somewhat rough and worm-eaten 

 aspect, and in colour is nearer to a dirty yellow 

 than a dull brown. If the posterior angle of the 



