THE EQUILIBEIUM. 5 



rating through the bit upon the mouth, 

 carries back the forces of the fore -hand 

 until they meet and balance the forces 

 of the croup brought up by a pressure 

 of the rider's legs, the horse is in 

 equilibrium at a halt, and the prepon- 

 derance of either of these forces with 

 a corresponding yielding of the other 

 extremity will result in motion. 



But this preponderance, as well as 

 the corresponding yielding of the forces 

 of the other extremity, must be great 

 enough only to bring about the motion 

 at the desired speed ; and the approxi- 

 mate equilibrium must be kept at all 

 times. That is, the point of union and 

 balance must be kept, as far as is 

 consistent with the rate of speed that 

 the rider demands, when the forces of 



