COMBINATION OF EFFECTS. 97 



brium all the parts of the horse which leave 

 it, in order to prevent him from going ahead, 

 without backing him, and vice versa : finally, 

 it serves to stop any movement from the 

 right to the left, or from the left to the right. 

 By this means, also, we distribute the weight 

 of the mass equally on the four legs, and 

 produce temporary immobility. This com- 

 bination of effects ought to precede and fol- 

 low each exercise within the graduated 

 limit assigned to it. It is essential when 

 we employ the aids (i. e. the hand and the 

 legs) in this, that the action of the legs 

 should precede that of the hand, in order to 

 prevent the horse from backing against any 

 place; for he might find, in this movement, 

 points of support that would enable him to 

 increase his resistance. Thus, all motion of 

 the extremities, proceeding from the horse 

 himself, should be stopped by a combination 

 9 



