10 ON THE ORIGIN AND DEVELOPMENT OF THE 



had become well developed and inclosed in follicles, through 

 the mouths of which they were seen. A similar change 

 was observed in reference to the papilla (2). The follicles 

 had been produced by the stretching across of productions 

 from the outer lip (which was very indistinct) towards 

 similar but much smaller productions from the inner lip 

 (which was still very prominent). The lines of junction 

 of the septa were visible, and the mouths of the follicles pre- 

 sented an unfinished appearance. The papilla (1) had become 

 surrounded by an incomplete follicle, in consequence of the 

 production of a notched lamina from the outer lip of the 

 groove, which lamina was almost met by a smaller slip of 

 membrane from the inner lip. The breadth of the superior 

 arch was 2 lines, length II line. 



6. IWi or 12^ week. Upper Jaw. The median lobule 

 (m, Fig. 12) had diminished so much 

 transversely, as to have become an- 

 tero-posterior ; while its supplement- 

 ary lobule had become attached to the 

 frenum of the lip. The lateral lobules 

 (n) had increased much transversely, 

 and appeared each to be divided into 



an anterior and a posterior portion. They were compressed 

 by the true palate, which was folded at this part, as at 

 the tenth week, into wrinkles, the longest and anterior 

 of which stretched across the median line from the right 

 to the left side. The papillas (3 and 4), with their fol- 

 licles, were fully developed. The other two papillae (1 and 

 2, Fig. 10) had not undergone much change, but the small 

 bulging (5, Fig. 10) had now become a distinct papilla, and 

 its follicle had begun to show itself. The uvula was well 

 marked. 



Lower Jaw. The lines of junction of the interfollicular 



