ENAMEL 



115 



describes tubes in the enamel of the hare, which have no 

 communication with the dentinal tubes. He considers that 

 these enamel tubes were originally continuations of the 



FIG. 65: Enamel of Rat. Transversely cut prisms showing projection 

 of the interprismatic substance on either side. ( x 800.) 



FIG. 66. Enamel of Rat near outer margin. ( x 650. ) 



dentinal tubes, but have been cut off from them by a process 

 of resorption in the early stages of development, and he 

 would explain the isolated enamel tubes found in the 

 marsupial Petaurus in the same manner. 



i 2 



