HOW TO TELL THE A&E. 



561 



FlG " 313. -From 2K to 3 years. 



toward the mouth, and present at first a cutting surface, with the 

 outer edge rising in a slanting direction above the inner edge. 

 This, however, soon begins to wear down, until both surfaces are 

 level, and the mark, which was 

 originally long and narrow, 

 becomes shorter, and wider, 

 and fainter. At six months 

 the four nippers are beginning 

 to wear to a level. Cut 310 

 will convey a good idea of the 

 appearance of the teeth at 

 twelve months. The four mid- 

 dle teeth are almost level, and 

 the corner ones becoming so. 

 The mark in the two middle teeth is wide and faint; in the two 

 next teeth it is darker, and longer, and narrower; and in the cor- 

 ner teeth it is darkest, and longest, and narrowest. At the age of 

 one year and a half, the mark in the central nippers will be 

 much shorter and fainter; that in the other two pairs will have 

 undergone considerable change, and all the nippers will be flat. 



At two years this will be more 

 plainly marked. Cut 312 is in- 

 tended to show the appearance 

 of the mouth at this stage. 



Cut 313 is intended to show 

 the appearance of the mouth at 

 two and a half to three years old. 

 The next is intended to show it 

 at three and a half years old. 

 The two central permanent teeth 

 are growing down, and are larger 

 than the others, with two grooves 

 in the outer convex surface, and 

 the mark is long, narrow, deep, 

 and black. Not having yet attained their full growth, they are 

 lower than the others. The mark in the two next nippers is 

 nearly worn out, and is wearing away in the corner nippers. 



Between three and a half and four years the central nippei-s 



FIG. 314. About 0)4 years 



