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THE POPULAR SCIENCE MONTHLY 



The elevated and lengthened trot is represented in Fig. 8. The 

 animal is depicted at the instant which in the notation is represented 

 by a dot ; that is to say, during the time of the suspension, at the 

 moment when the left diagonal biped has just risen, and the right 

 diagonal biped is about to descend. 



Tracings afforded by the walking-pace are shown in Fig. 9. If 



we let fall a perpendicular from the 

 points at which the curves com- 

 mence, we shall have the positions 

 of the successive impacts of the 

 four legs. The order of succession 

 of impacts is represented by the 

 letters AB,PG,AG, PD, that 

 is to say, right fore-foot, left hind- 

 foot, left fore-foot, right hind-foot. 

 The notation of the rhythm of the 

 pressure of each foot, as derived 

 from the registered curves, shows 

 that the interval which separates 

 the impacts is the same throughout, 

 and consequently that the horse 

 rests during the same time on the 

 lateral as on the diagonal bipeds. 

 This, however, is not always the 

 case, some horses resting longer on 

 the lateral biped than on the diag- 

 onal, and vice versa. The change 

 of position of the centre of gravity 

 may be seen by reference to Fig. 

 9. From 1 to 2 the horse will rest 

 on the right lateral biped ; from 2 

 to 3 on the right diagonal biped 

 (that is to say, on that in which the 

 right foot comes first) ; from 3 to 4 

 on the left lateral biped ; from 4 to 

 5 on the left diagonal biped ; again, 

 from 5 to 6 the horse would find 

 himself, as at the beginning, on the 

 right lateral biped. 



Observations on draught-horses 

 have shown that, when the animal 

 strives to react against a load, he may have three feet on the ground 

 at once. This is held by some to be the rule in the normal walking- 

 pace, but M. Marey has proved to the contrary. The vertical oscilla- 

 tions of the walk are chiefly at the withers, those of the croup being 

 very slight. The actions of the hinder parts seem to consist chiefly 



