DENTINE 



277 



FIG. 176. Adult human molar affected by caries. Action of aoids of caries, 

 showing striation and contours as in figs. 178 and 179. ( x 600.) 



Fro. 177. Sharpey's fibres penetrating forming cement ; from the same 

 tooth as that from which figs. 170 and 171 were taken. ( x 350.) 



