14 



THE OX AND THE DAIRY. 



FIFTH TEAR. 



teeth have been growing, the two central permanent teeth 

 first, and then the next, have been wearing, and show the 

 marks of attrition ; which, at the age of six years, will have 

 extended to the whole set. The teeth become flattened at 



SIXTH TEAR. 



the top, with a dark central mark, bounded by a line of bone, 

 and this by the layer of enamel. As yet the four middle teeth 

 are the largest ; but, again, by slow degrees, a change takes 

 place, and the process of absorption and wearing down goes 

 on. First, the two central teeth show this, then the next on 

 each side, till, at the age of ten, the four middle teeth are 



TENTH TEAR. 



