115 



years all the tables take so marked a shape, but some 

 of them, and generally those in the centre, will, at 

 this period, be symbolical of the truth. 



Had it not been for the very conspicuous indica- 

 tion of the central tables, the others in the former 

 wood-cut might have been reasonably decided to be 

 more juvenile in their aspect. 



55. At twenty years old, the form of the mouth 

 has changed, and the lower teeth are irnperfectly seen 

 from the front. This circumstance springs from the 

 more horizontal direction which the teeth have now 

 assumed, and the acuteness of the angle which they 

 consequently form when closed. The engraving also 

 depicts that alteration in position which disables 

 a person, standing in front, from well seeing both 

 rows of incisors when the lips are separated. When 

 the upper incisors are fairly presented to the sight, 

 a partial view only of the lower teeth is obtained, 



I 2 



