THE GAITS IN PARTICULAR. 



565 



beat, AG, is heard at the end of the first third of the con- 

 tact of the posterior right. 







5 . G 



FIG. 255. Notation of the running gallop, furnished by the instantaneous photo- 

 graphs of the American horse Sallie Gardner. 

 (From M. Lenoble du Teil.) 



The result of this rhythm is to render the times un- 

 equal, for the beats PD and AG occur in more rapid 

 succession than the others. 



After the contact of the anterior right member follows 

 the phase of projection (6), which M. Lenoble du Teil has 

 valued at one-fifth of the total duration of the complete 

 step ; then a new stride is accomplished, and so on. As 

 to the successive bases of support, they diifer somewhat 

 from those of the ordinary gallop. Excepting the first (1) 

 and the last (5), which are unipedal, the other three are 

 bipedal, and it is the diagonal upon which the body is 

 sustained for the longest time. 



Finally, as in the gallop with three times, it is the 

 members of the diagonal biped, which cause the first and 

 the fourth beat, that are the most fatigued. 



The facts which we have just presented differ in a 

 measure from those which M. Marey has observed. Al- 

 though the differences concern principally the details, it is 

 nevertheless necessary to collect more numerous data in 

 order to remove all doubts as to the truth of these facts. 



The trail of this gallop is characterized by the great 

 length of the projection, as well as that of the diagonal 

 base, which is always much in excess of three-fourths of 

 the height of the horse. Fig. 256 reproduces from the 

 estimates of M. Lenoble du Teil the distance between the 

 imprints furnished by the instantaneous photographs of 

 Sallie Gardner. 



The length of the step, measured between the two suc- 

 cessive imprints of the posterior left, is equal to 4.41 m. 



" 



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