THE HORSE IN MOTION. I 17 



as has been already stated. This change from a walk to a trot is 

 shown in the fine silhouette (Plate XLI.). 



Single-foot is an irregular pace, rather rare, and distinguished by 

 the posterior extremities moving in the order of the fast walk and the 

 anterior ones in that of a slow trot. These mixed paces are quite 

 compatible, as they are of the same kind and move in the same diago- 

 nal order. It is illustrated by Plate LV. The rhythm of the foot- 

 falls is characteristic, and once heard will ever after be recognized, 

 even in the dark. The same horse is made to illustrate the regular 

 walk in Plate L. 



