PLATE XIX. 



1 



I 



j 

 ■ I) 



- E 



I 



i 



— F 



.-■^«g-<to;.;^.^: ...^ 



Fig. 3. 



From longitudinal section of developing tooth of lamb, x 150. 

 A, Secreting cells of stratum intermedium. b, Outer ameloblastic 

 membrane, c, Ameloblasts or enamel cells, d, Inner ameloblastic 

 membrane, e, Enamel, f, Dentine. G, Odontoblasts. 



— A 



— r. 



■: ■•'".jj 



— D 



- F 



Fig. 4. 



Section of developing incisor of mouse, x 400. a, Cells of stratum 

 intermedium, from which secreting papilhe are developed. B, Outer 

 ameloblastic membrane, c, Ameloblasts. d, Formation of enamel by 

 deposit of globular bodies from enamel cells, e, Dentine, r, Odontoblasts 



