THE DEVELOPMENT OF THE JAW. 



179 



fectly formed. The depth of these bony cells is only suffi- 

 cient to contain the developing teeth and tooth pulps, the 



FIG. 77 ( ! ). 



0) Upper and lower jaws of a nine months foetus, the teeth having 

 been removed from the jaws on one side to show the extent to which they 

 are calcified at this period. (Two-thirds life size.) a. Alveoli of lateral 

 incisors, b. Alveoli of canines, c. Alveoli of second temporary and first 

 permanent molars. A bristle has been passed through the inferior dental 

 canal. 



N 2 



