PULPS AND SACS OF THE HUMAN TEETH. 13 



latter in a valvular manner. When these edges — viz. the 

 continuous semicircular outline of the whole palate — were 

 raised by the needle, the dental groove and its contents — 

 viz. ten papilhe in their follicles — were seen. It was observed 

 that the follicles had increased relatively, the papilhe only 

 absolutely, in couseiiuence of which the latter, instead of pro- 

 jecting from, had receded within, the mouths of the former. 

 The mouths of the follicles had apparently become smaller. 

 This had arisen in consequence of the greater development of 

 the laminte which were seen in the earlier 



3 



stages. There were two, an anterior and a * /:7Zi^ 



posterior, for the four anterior follicles ; three, (^0 "*=*^ 



an internal and two external for the third on ^ /^. 

 each side ; and four for the two posterior on J^r^ 

 each side (Fig. 15). Close upon the inner ' r;\3j) 

 side of the mouth of each of the follicles /70,, 

 there was observed a little depression iu the ^^/ 

 form of a crescent, its concave edge being to- ^'^' ^''- 



wards the former. These depressions were most distinctly 

 marked at the four or six anterior follicles, where they 

 were situated immediately behind their inner lips (a a a 

 a a). 



Lower Jav. — Tlie papilla had receded. The lamincne of 

 the follicles were more developed (Fig. 16). 

 Little depressions or lunula3 had appeared 

 similar to those in the upper jaw. When 

 the membrane of the dental groove with 

 its adherent follicles and their pulps, 

 was stripped off, the dental nerves and vessels were found 

 running along under the foUicles, and distril)uting vascular 

 branches and a nervous twig to each of them (Fig. 1-i). 

 Each of the individual follicles, with its papilla, vascular 

 branches, and nervous twig, exactly resembled a large hair- 

 bulb with its nerve and vessels exposed after the hair has 



