82 THE HORSE IN MOTION. 



speed of the horse does not depend upon the length of the limbs 

 acting as pendulums, but upon the lengtli and thickness of the 

 locomotor muscles, the angles and lengths of the bony levers on 

 which they act, the freedom of their articular ligaments, the corre- 

 lation of all the mechanical parts, and much also on the nervous 

 energy or will transmitted to the muscles, technically known as 

 courage. 



