4 
"We epithelial papillae 
} ameloblasts 
jouter layer of enamel 
eeeensiiemineemiameamienmn ee inner layer of ename!| 
dentine 
Fig. 25 Longitudinal section of upper incisor of a 5-month albino rat. The 
letter a shows where the next illustration (fig. 26) is taken. X 6. 
Fig. 26 Small portion of the preceding, more highly magnified, to show 
the enamel-organ and the enamel, and the odontoblasts and dentine. X 185. 
84 
