146 NORMAi, HISTOLOGY AND ORGANOGRAPHY. 



formula for one side being, 1.|- C.^j- M.f = 10. The 

 second set, or permanent teeth, number thirty-two 



'"Enamel. 



Pulp cavity. 



-Dentm. 



Cementum. 



w 



Jp/ 



Fig. 104. Scheme of a longitudinal section through a human 

 tooth. In the enamel are seen the "lines of Retzius" (Bohm and 

 Davidoff). 



