THE TEETH. 



637 



FIG. 275. SECONDARY DENTINE, WITH GLOBULAR FORMATIONS 

 OF THE BASIS-SUBSTANCE. 



PD, primary dentine; 8D, secondary dentine, with irregularly scattered canaliculi ; IB, 

 globular bodies of secondary dentine, between which the dentinal canaliculi run, all in connec- 

 tion with those of the primary dentine. Magnified 500 diameters. 



I have observed from my specimens that the lamellated structure begins close 

 to the termination of the primary dentine in an almost continuous course. 

 The lamellae themselves never are very regular, and produce broader and nar- 

 rower layers which, as a rule, are not strictly parallel to each other. In the 

 interstices between the lamellae, here and there, I have met with flat layers of 

 bioplasson. The canaliculi piercing the lamellated dentine are generally very 



FIG. 276. SECONDARY DENTINE FROM CANINE. 



JP, bioplasson bodies with the reticular structure and offshoots ; B, basis-substance with 

 the light, net-like structure. Magnified 1000 diameters. 



