251 



PART YI. 



KiDING. 



§ 190. We have endeavored to show how seri- 

 ously the inequahty of action in symmetric parts, 

 and the consequent, imperfect, and " shackly " 

 movement of central points may interfere with 

 personal locomotion. 



Not less do these faults interfere with the seat 

 on horseback, indeed the trouble here is still more 

 serious, for the points of appui instead of being on 

 an immoveable surface, which will await the ad- 

 justment of the body, as does the ground, have 

 place on another body, w^hich is continually in 

 motion, and, if not met in time, are at once re- 

 moved. Thus, if the seat bcnes of the rider do not 

 move equally, one of them, generally the right, is 

 left behind by the motion of the horse. Hence, 

 that hanging back of the right shoulder so general- 

 ly to be observed, even in passable horsemen. When 

 this fault exists, it is only by making the knees, in- 

 stead of the seat bones, the points of appui, that 

 an action of the shoulder may make up for this loss 

 of position, and it is in fact thus made up, with a 

 sort of hop on the other seat-bone, for which the 



