THE HORSE AND ITS VARIETIES. 



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The horse (Equus caballus Linn.) is the most useful of all 

 domestic animals, and next to ships a prime means of the 

 diffusion of civilization. By artificial selection a great num- 



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ber of varieties, races, and strains have been produced, 

 adapted for the performance of different kinds of work. The 

 horse only exists in a domesticated state. Sunson states thnf 



