AGE. 



215 



11 years, Upper Jaw. The marks Lave disappeared. 



e 



The Mark, dissected as it 

 were. (See page 221.) 



c, The Dentinal star, some- 

 times mistaken for the 

 mark. (See page 221.) 



12 years, Lower Jaw. Change in shape is now clearly defined. 

 The respective pairs (centrals, dividers, corners) assume in turn 

 (from 13 years till old age) various shapes — semi-square, rounded, 

 triangular, wedge-shaped, etc. 



