66 



THE CONNECTIVE TISSUES 



[CH. V. 



molars in the child. They differ from them, however, in some 

 respects, the temporary molars having a stronger likeness to the per- 

 manent than to their immediate descendants the so-called bicuspids, 

 besides occupying more space in the jaws. 



The temporary incisors and canines differ from their successors 

 but little except in their smaller size and the abrupt manner in which 

 their enamel terminates at the necks of the teeth, forming a ridge or 

 thick edge. Their colour is more of- a bluish-white than of a yellowish 

 shade. 



The following tables show the average times of eruption of the 

 Temporary and Permanent teeth. In both cases the eruption of any 

 given tooth of the lower precedes, as a rule, that of the corresponding 

 tooth of the upper jaw. 



Temporary or Milk Teeth. 



The figures indicate in months the age at which each tooth appears. 



Permanent Teeth. 

 The age at which each tooth is cut is indicated in this table in years. 



The times of eruption given in the above tables are only approxi- 

 mate: the limits of normal variation are tolerably wide. Certain 

 diseases affecting the bony skeleton, e.g. Kickets, retard the eruptive 

 period considerably. 



It is important to notice that it is a molar which is the first tooth 

 to be cut in the permanent dentition, not an incisor as in the case of 

 the temporary set, and also that it appears behind the last deciduous 

 molar on each side. 



The third molars, often called Wisdoms, are sometimes unerupted 

 through life from want of sufficient jaw space and the presence of 



