THE AQE OF TKK HORSE. 79 



year, from tlio uext pair at the ago of two years, and 

 from the corner uippers at the age of three years. 

 The milk-teeth are replaced by the permanout teeth 

 in the following order : 



(1) One to two weeks after birth the first two teeth 

 (centre nippers) of the set of milk teeth appear in 

 lower and upper jaw, (Fig. 13-1) which, at the age of 

 two years, become loose and fall out, and in their 

 places appear permanent teeth (No. 4) with deep 

 cavities or marks and sharp edges. 



(2) About six weeks after birth, appear the next 

 pair of milk teeth in both jaws, (No. 2), which fall 

 out with three years old, and permanent teeth grow 

 up in their place, (No. 5^. 



(3) About eight months old, the last milk ieeth, 

 the co*«<'C w(/<j[jers appear, (No. 3) wiiich fall out at 

 tlie age of four years, and the last permanent teeth 

 make their appearance, (No. G) so that with five 

 years old, the teeth are all inJine and Ihe horse has 

 his jiermanent set of lath. 



The teeth grow eveiy jear from ^ to I, of an inch, 

 but are worn away at the same ratio by use, so chat 

 with — 



Six years old the black cavities or marks have 

 disappeared from the centre nippers. (Fig. 7). 



Se\en years old the black cavities or marks have 

 disappeared from ihe next pair. (Fig. 8). 



