DEVELOPMENT OF THE TEETH. 4:19 



The order of eruption of the permanent teeth is as fol- 

 lows : 1 



The two central incisors of the lower jaw appear from the sixth to the eighth 

 year. 



The two central incisors of the upper jaw appear from the seventh to the 

 eighth year. 



The four lateral incisors appear from the eighth to the ninth year. 



The four first bicuspids appear from the ninth to the tenth year. 



The four canines appear from the tenth to the eleventh year. 



The four second bicuspids appear from the twelfth to the thirteenth year. 



The above are the permanent teeth which replace the tem- 

 porary teeth. The permanent teeth which are developed de 

 novo appear as follows : 



The first molars appear from the sixth to the seventh year. 



The second molars appear from the twelfth to the thirteenth year. 



The third molars appear from the seventeenth to the twenty-first year. 



1 SAPPEY, Traite d'anatomie, Paris, 1874, tome iv., pp. 113, 116, 119. 





