THE TEETH. 319 
made their appearance. Both sets are contained within the jaw at birth, 
the permanent teeth being small and only partially developed, and lying 
deeper than the milk teeth. As the mouth grows, it becomes too large 
for its first set of teeth ; and the roots of these being pressed upon by the 
erowth of the permanent set, their fangs are absorbed, and allow the new 
teeth to show themselves, either in the places of the former, or by their 
sides, in which case they are known by the name of wolf’s teeth. ‘This 
change proceeds in the same order as the cutting of the milk teeth, com- 
mencing with the first grinder, which is shed and replaced by a per- 
manent tooth early in the third year, a fifth grinder (permanent) making 
its appearance about the same time. Towards the end of this year the 
sixth grinder shows itself, but grows very slowly, and the central nippers 
above and below fall out, and are replaced by permanent ones, which, 
as before remarked, are considerably larger in size and somewhat different 
in form. 
bic. 7.—Mouru oF THE Cour 42 Four anv a Haur YHARS. 
z\. Anterior maxillary bone. growth, with the edges of the cavity 
. 1. Central nippers, considerably worn down. sharp, and the mark very plain. 
2. 2. The next pair, fully developed, with their 4. 4. The tushes showing themselves through 
edges slightly worn. 
the gum, but not full-grown. 
3. Corner permanent nippers, in a state of 
bad 
or) 
AT THREE YEARS the mouth presents the appearance shown on the 
opposite page, the development of the permanent teeth varying a good deal 
in different individuals. At three years and four or six months, the next 
nipper all round falls out, and is replaced by the permanent tooth. The 
corner nippers are much worn, and the mark in them is nearly obliterated. 
About this time also the second grinder is shed. 
AT FOUR YEARS OF acu, the mouth should differ from that represented 
