TIME 1 1 



same time as the posterior left leg, the horse is 

 trotting (third record). It is thus seen with what 

 simplicity the ordinary paces of a horse may be 

 recorded both as regard sequence and duration.* Paces 

 that involve a springing movement, i.e. the various 

 forms of galloping, can be analyzed with equal facility 

 in spite of their greater complexity. 



Fig. 8.— Three records of the paces of a horse : amble, walk, and trot. 



Fig. 9 is the record of the ordinary triple-heat 

 gallop, i.e. that in which the combined fall of the 

 hoofs produces three sounds appreciable to the ear. 

 The diagram shows how the three sounds are produced. 



The simple interpretation of this written record is 

 that, in A, the first sound is made by the left hind 

 foot. The second by the simultaneous fall of the left 

 fore, and of the right hind foot. The record demon- 

 strates still another fact, for, in B, it can be seen by 

 what feet the body is at any moment supported. It 

 is clear that at first the weight falls only on one leg, 

 then on three, and then successively on two, three, 



* In this record we have represented the trot as a walking pace, 

 this is an exceptional ctse. The ordinary trot is a form of running, 

 and its graphic record shows a moment of '"suspension," as in the 

 case of a man running. 



