'^mi 



11 years, Upper Jaw. The marks have disappeared. 



The Mark, dissected as it 

 were. (See page 58.) 



<5, The Dentinal star, some* 

 times mistaken for the 

 mark. (See page 209.) 



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. 



