TEETH. 



135 



least attained its twelfth year. The natural size has been considerably 

 enlarged, as the author thereby hoped to render the contrast the more 

 obvious. This last member, it will be remarked, has parted with its 

 juvenile width, or is kow characterized by depth and angularity. The 

 central cavity, it will also be observed, bears small resemblance to the 

 natural depression which it is meant to imitate. The color, moreover, 

 is quite black, and of an even tint throughout, while the presence of the 

 girding line of enamel cannot be detected. 



The difference, however, is more striking, when two full rows of teeth 

 are placed in contrast one with the other, after the manner in which they 

 are displayed in the next engraving. In the young mouth, the incisors 

 are arranged in a gracefully curved line ; the posterior margins of the 

 organ present little peculiarity. In the aged teeth, the prominent 

 center of these has retracted, while all idea of grace in the order of their 

 disposal has departed. Each member in the old jaw evinces an inclina- 

 tion to become equally prominent, and the posterior borders evince an 

 obvious angularity. 



DIAGRAM, SHOWING THE TABLES OF A NATITKAL ROW OF FIVIi-TEAR OLD TEETH. 



THE TABLES OF THE BI8H0PED TEETH WHICH BELONG TO AN ANIMAL SIXTEEN YEARS OLD. 



Then, if the marks in each are examined, the central cavities in the 

 "bishoped have jagged edges ; while from these indentations arise certain 

 eccentric lines, which invariably run toward the circumference. Such 

 lines evidently were not made with any design. They were caused 

 either by the inaptness of the operator, the coarseness of the tool with 

 which he worked, or they were provoked by the natural struggles of the 

 animal that was subjected to a merciless operation. The marks, more- 

 over, are of a deep-black color^, while the lines are remarkable for some- 

 times being of a lighter hue than the surface on which they repose. 



