PULPS AND SACS OF THE HUMAN TEETH. 11 



septa had almost disappeared, and the mouths of the follicles 

 had become more distinct. The mouths 

 of the three anterior follicles had an an- 

 terior lip, the free edge of which was 

 directed somewhat inwards. It was ne- 

 cessary to lift up this lip with the needle 

 to obtain a view of the contained papilla. 

 At the posterior part of the dental groove, 

 another papilla with a notched lamina, 

 both productions from the external lip, had appeared (5, Fig. 

 13). Breadth of superior arch 12i lines ; length, 2. 



7. I3th week. Upper Jaw. There was little change in 

 the configuration of the palate since the former week. The 

 lobe running across the median line was still visible. The 

 frenum of the upper lip had become closely attached to, and 

 continuous with, the median lobule. The outlines of the 

 horse-shoe lobe were still perceptible, and on its external side 

 the lobule, all along marked (r), was visible. The outer lip of 

 the dental groove, or the external alveolar process, was equally 

 developed all around. The upper lip was still much retracted. 

 There were ten papillae inclosed in open-mouthed follicles, and 

 ranged at nearly equal distances all around the dental groove.* 

 The four anterior papillse were flattened from before back- 

 wards with a straight edge, and were somewhat similar to 

 the future incisive teeth. The next one on each side was a 

 simple cone. The two posterior on each side were also 

 conical, but flattened transversely, so as considerably to 

 resemble carnivorous molars. Each of these papillae ad- 

 hered by its base to the fundus, while its apex, as during 

 the eleventh and twelfth weeks, presented itself at, or, as 

 in the present instance, protruded from, the mouth of its 



* Arnold, Salzburg Med.-CMrurg. Zeitung, 1831, Erster Band, p. 236. 

 Valentin, Handbuch der EntivicJcelungs-geschichtc des Mcnschen, p. 482. 



