THE IMPROVED ART OF FARRIERY. 17 



other. At nine years old the nippers hecome rounded, 

 the dividers oval, and the corner teeth have become 

 narrow ; the central diminishes, and approaches the 

 posterior edge. At ten years old the dividers are be- 

 come rounded ; the central enamel is very near the 

 posterior edge and rounded. At eleven years old the 

 dividers have become rounded ; the central enamel is 

 hardly any longer apparent in the teeth of the lower 

 jaw. At twelve years old the corner teeth are rounded ; 

 the central enamel has completely disappeared; the 

 yellowish band is of more extent, and occupies the 

 centre of the wearing surface ; the central enamel re- 

 mains in the teeth of the upper jaw. At thirteen years 

 old all the lower incisor teeth are rounded ; the sides 

 of the nippers are becoming longish ; the central 

 enamel remains in the teeth of the upper jaw, but it 

 is round and approaching to the posterior edge. At 

 fourteen years old, the lower nippers have an appear, 

 ance of becoming triangular ; the dividers are becom- 

 ing long at the sides ; the central enamel of the upper 

 teeth diminishes, but still remains. At fifteen years 

 old the nippers are triangular, the dividers beginning 

 to become so ; the central enamel of the teeth of the 

 upper jaw has not disappeared as yet. At sixteen 

 years of age the dividers are triangular, the corner 

 teeth beginning to become so ; the central enamel of 

 the teeth of the upper jaw will, in many instances, be 

 found to have disappeared. At seventeen years of 

 age, all the teeth of the lower jaw have become com- 

 pletely triangular ; but, as we have before seen, the 

 sides of the triangles are all of a length. At eighteen 

 years of age the lateral portions of the triangle lengthen 

 in succession, first the nippers, then the dividers, and 

 afterwards the corner teeth : so that, at nineteen years 

 of age, the lower nippers are flatted from one side to 



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