342 CLASS MAMMALIA. 



fall out about fifteen days after birth ; at two 

 years and a half the middle teeth are replaced ; 

 at three and a half the two following ; at four 

 and a half the two outermost, called the corner 

 teeth. All these teeth have the crowns at first 

 indented, and lose their indentation through 

 detrition by degrees. At seven years and a 

 half or eight years, all these are effaced, and 

 the horse is no longer marked. 



The lower canine teeth come at three years 

 and a half ; the upper at four; they continue 

 pointed till six ; at ten they begin to peel off. 



The life of the Horse seldom exceeds thirty 

 years. 



All the world knows to what an extent this 

 animal varies in colour and size. Its principal 

 races even have sensible differences in the 

 form of the head ; the proportions and aptitude 

 for different sorts of employment. 



The lightest and most fleet are the Arabian 

 Horses, which have assisted in improving the 

 Spanish race, and contribute with that to form 

 the English race. The heaviest and strongest 

 come from the coasts of the North Sea. The 

 smallest from the north of Sweden and Corsica. 

 Wild Horses have the head large, the fur crisp, 

 and inelegant proportions. 



The Dziggetai, {Equus Hemionus, Pall.) Schreb. 

 Is a species which, as to its proportions, is 



