12 ON THE ORIGIN AND DEVELOPMENT OF THE 



follicle. The point of the needle could be introduced through 

 the mouth, so as to move the papilla about in the interior of 

 the follicle. 



By removing the outer lip of the dental groove, and the 

 outer wall of all the follicles by the scissors, a good view was 



obtained of the configuration of these 

 parts (Fig. 14). The follicles were 

 " Y V V observed to be mere duplications of 

 the membrane of the groove, and 



consequently of the general gastro-intestinal mucous membrane. 

 The inner surface of the follicles was of a greyish-yellow 

 colour. The papillae had increased relatively so as to protrude 

 from the mouths of their follicles. They were granular, friable, 

 and of a dead- white colour. 



Lower Jaw. No remarkable change had taken place in 

 the lower jaw, except in the relative enlargement of the papillae, 

 and in the distinct development of the follicle of the posterior 

 papilla (5, Fig. 13). The outer lip of the dental groove was not 

 very distinctly marked, but the inner was well developed. 

 The breadth of the superior arch was 3 lines, and the length 

 was also 3 lines. 



8. 14th week Upper Jaw. The median lobule had 

 undergone little change, the lateral lobules had become 

 broader from before backwards, apparently in consequence, of 

 the retraction of the palate, which, instead of exhibiting on 

 its anterior part the confused transverse wrinkles formerly 

 mentioned, presented on its lateral divisions (corresponding 

 to the horse-shoe lobe) four or five parallel rugae, which were 

 apparently remains of the wrinkles. The upper lip had 

 again become full, so that its free edge was on a level with 

 the surface of the palate. The soft outer edges of the palate 

 and the anterior edges of the lateral lobules were now closely 

 applied to the outer lip of the dental groove, so as to close the 



