SEVEN YEARS. 



The cavity is worn out of the lower front and middle incisors, 

 and is shallow in the corner ones. Viewed in profile, the posterior 

 edge of the lower corner incisor is well in advance of that of the 

 upper jaw ; a fact which, generally, gives to the latter a hook-like 

 prominence, from unequal wear. This downward projection is, 

 often, filed level, in order to give the animal a false appearance of 

 youth. The corner incisors, in this example, are fissured. 



