THE SCIENTIFIC EQUITATION 



ion of the scapulo-humeralis articulation, high for 

 the extension of the lower leg, these movements are 

 made to occur alternately, both with the horse 

 standing and in motion. 



There are, then, three effects of the hand holding 

 the reins. The first prevents movement forward. 

 The second directs the body when in motion. The 

 third raises and sustains the front hand either stand- 

 ing or moving. 



Thejambettes of the hind legs are obtained by the 

 effects of the rider's legs, and involve nothing more 

 than a flexion of a limb sustained for a short time. 

 As soon as the effect has ceased, the horse's leg 

 returns to the ground for the next stride. (Figure 

 29.) 



The value of the jambettes of the hind legs is that 

 they enable the rider to set the limbs at right angles 

 to the ground and parallel to each other when the 

 horse is standing; or when the horse is in motion, 

 they enable the rider to secure an equal impulse 

 from both hind legs. 



For it is obvious that it is not by the lifted limb 

 that the horse sends its body forward, but by the 

 other which is on the ground. For example, the left 

 hind foot cannot be lifted, unless the right hind foot 

 is in contact with the ground, in order that the 

 right leg may bear the load which the left has been 

 supporting. The right leg is, therefore, in position 

 for the impulsion. But when this impulsion is 

 finished, the left leg will have returned to the 



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