I'ULPS .VND SACS OF THE HUMAN TEETH. 15 



middle of the transverse band of the palate. This last curve 

 was the result of the anterior junction of the lolies {d d, Fig. 2), 

 and was traced through all its phases to its present state. 

 The median suture of the palate proceeded from it posteriorly. 

 The dental gi'oove being torn open by means of the needles, 

 its lips were found to have adliered pretty firmly, as before 

 mentioned, but a feeble adhesion only had taken place between 

 its walls so as to allow its contents to be restored to their 

 ori'Tinal condition by means of a blunt instrument. This was 

 carefully done imdcr water, and the mouths of all the follicles 

 with their laminfc were displayed. The latter were more 

 developed than in the last subject, and completely concealed 

 the papilla. The former required to be lifted up in order to 

 display the latter. Careful observation during the separation 

 of the contents of the groove disclosed the important fact that 

 the general adhesion had not obliterated the little crescent- 

 shaped depressions behind the mouths of the follicles. These 

 retained the smooth gi-eyish-yellow colour of the walls of the 

 original groove, and from this circumstance could be distin- 

 guished from the general flocculeut appearance of the other 

 parts. 



Lower Jaw. — The outer lip of the dental groove had in- 

 creased in size, and was as prominent as the inner, except 

 posteriorly, where the latter still retained its posterior lobe ; 

 but the most remarkable change which 

 had taken place since last week was 

 the complete adhesion of both lips, as 

 in the upper jaw, with the exception of 

 a small portion posteriorly, which still 

 retained the jjeculiar appearance of the 

 dental groove, and in which nothing could 

 be seen but the smooth nnicous membrane ( n. Fig. 18 ). 

 AVlien the dental groove was torn open, as was done in the 

 upper jaw, the laminte (which were highly developed) of the 



