THE GAITS IN PARTICULAR. 



549 



lories of the phase of- elevation, they are equally comparable to those of the trot. 

 Only, those of the coxo-femoral articulation and the angle of the haunch, at 

 first concave, soon become greatly convex superiorly. 



These two curves, considered during the two phases of contact and of eleva- 

 tion, are very incurvated in their middle in the gallop, while in the trot, on the 

 contrary, they are more convex. 



Number, Nature, Succession, and Duration of the Bases 

 of Support ; Duration of the Contacts of the Feet and of 

 the Projection. The members, in this gait, succeed each other with 

 such rapidity that it is impossible, with the eye, to analyze their con- 

 tacts with accuracy. Experiments making use of the graphic method, 

 or chrono-photography alone, can give its definite information in this 

 respect. Although the actual investigations are not numerous, never- 



FIG. 240. Tracings, notation, and reactions of the gallop of the trained horse. 



(From M. Marey.) 



PG, curve and notation of the posterior left foot. 

 PD, curve and notation of the posterior right foot. 

 AG, curve and notation of the anterior left foot. 

 AD, curve and notation of the anterior right foot. 

 .R, curve of the reactions of the withers. 



theless they permit us to establish a certain number of facts, which wo 

 will present. 



Fig. 240, which we borrow from M. Marey, 1 represents, by con- 



1 Marey, La machine animale, p. 172. 



