364 TYPES AND MARKET CLASSES OF LIVE STOCK 



thrust, and the more nearly will this line approach the horizontal. 

 As a horse has to raise himself vertically with each bound, it 

 is naturally a matter of very great importance whether he has 

 to lift a dead weight or a weight which throws forward. A 

 jockey on the horse's neck adds to the forward weight, and this 

 moves the center of weight still further forward and places still 

 more weight on the fore legs and equally less on the hind legs. 

 The longer the angle of thrust, the easier and therefore the 

 faster the horse will go, for his power will then be utilized almost 

 exclusively in a horizontal thrust resulting in speed, and little 

 of his energy will be consumed in simply raising weight to let 

 it fall again. It is the same as a man pushing a wheelbarrow; 



c 



Fig. 118. The Horse in Motion. 



A, Center of weight; AB, line of thrust; ABC, angle of thrust; Y, center 

 of weight when rider is over neck of horse; X, center of weight when rider 

 sits near the tail. 



if the load is near the handles it must be raised at each step, 

 while if the load is over or near the wheel the man does not 

 expend so much energy in a lift at each step, but can use all 

 his force at pushing straight ahead. 



Where the wear comes. From what has been said con- 

 cerning the function of the fore legs in supporting most of the 

 horse's weight, we can readily understand that the horse is 

 more apt to tire, exhaust, and ruin his fore legs than his hind 

 ones. It is common to see men driving their horses at speed 

 when going down hill, thinking that the horse is doing little 



