312 



THE HUMAN BODY. 



columnar cells. Through the opening on the fang blood- 

 vessels and nerves enter the pulp. 



The dentine (ivory) yields on analysis the same niate- 



94. Section through a premolar tooth of the cat still imbedded in 

 aeden he bone of 



rials as bone but is somewhat harder, earthy matters con- 

 stituting 72 per cent of it as against 66 per cent in bone. 

 Under the microscope it is recognized by the fine dentinal 



