234 



ELEMENTARY PHYSIOLOGY 



.A^^^nm^ 



. Fin. n. 



A. Enamel fibres viewed in transverse section. 



B. Enamel fibres separated and viewed laterally. 



C. A section of a tooth at the junction of the dentine (a) with the 

 cement («) ; 6, c, irregular cavities in which the tubules of the dentine 

 end ; rf, fine tubules continued from them ; /, g, lacunse and canaliculi of 

 the cement. (Magnified about 400 diameters.) 



immediate contact with the inner surface of the dentine, 

 consists of a layer of nucleated cells so close set that they 



