26 



circles these teeth, dips into their fissures, and fills 

 their infundibula, forming no small part of the sub- 

 stance of the molars. The subjoined wood-cut will 

 better explain the manner in which the various sub- 

 stances are arranged. 



Fig. 1. Fig. 2. 



Figure 1 represents the table of one of the molars 

 taken from the upper jaw. Figure 2 the table of a 

 molar extracted from the lower jaw. The difference 

 of size between the two organs is thus well marked, 

 as also the difference of shape. The white line indi- 

 cates the enamel, and the variegated substance which 

 is encircled by it, denotes the comparative quantity 

 and position of the ivory. The crusta petrosa is re-« 

 presented by the somewhat darker shade situated on 

 the exterior of the enamel. In figure 1, however, 



