AGE OF THE HORSE AS SHOWN BY THE TEETH 65 



gum ; the fang is that part which is hidden in 

 the jaw ; and the neck is the portion which 

 unites the crown and fang and is surrounded by 

 the gum. 



The upper or superior part of the crown is 

 termed the table, and comes into apposition 

 with the tooth of the opposite jaw when the 

 mouth is closed. Through the tooth, to a greater 

 or lesser degree, and commencing at the bottom 

 of the fang, runs a cavity termed the ' pulp 

 cavity,' or sac, in which is contained the pulp, 

 the pulp being composed of bloodvessels and 

 nerves, with a certain amount of connective 

 tissue. 



Three different substances enter into the 

 composition of a tooth : firstly, the dentine, or 

 ivory ; secondly, the enamel ; and thirdly, the 

 crusta petrosa. 



The dentine, or ivory, forms the greater bulk 

 of the tooth, and is centrally situated. On the 

 outside of that part of the dentine which 

 projects above the gum is situated the enamel, 

 a white, glistening, extremely hard substance — 

 the hardest portion, in fact, of a tooth. The 



