CHARACTERS OF TEETH. 



13 



canines, one on each side above and below ; these are generally 

 more or less pointed teeth, serving chiefly for fighting or defence. 



Central 

 Hall, 

 Bay I. 



Diagrammatic section of various teeth. 



1. Section of tusk of elephant, a permanently growing tooth. II. Section 

 of a young human incisor still growing, the root not yet fully formed. 



III. Section of human incisor fully formed, the root being complete. 



IV. Section of human molar showing the low-crowned (brachyodont) 

 condition, the cusps being rounded tubercles (bunodont). V. Section of 

 the molar of an ox, showing the high (hypsodont) complexly folded 

 crown. In the figures the enamel is black, the pulp white, the 

 dentine represented by horizontal lines, the cement by dots. 



Behind these again are the cheek-teeth which have to do mainly 

 with the breaking up of the food before it is swallowed : in the 



