* 

 THE GAITS IN PARTICULAR. 533 



4th. In each biped, anterior or posterior, when one member is on the 

 ground its congener is in the air, and vice versa. 



5th. If vertical lines corresponding to each one of the beats be drawn 

 downward, commencing with that of the anterior right foot, which bears the 



FIG. 224. Tracing and notation of the walk with equality of the lateral and diagonal contacts. 



AD, anterior right beat. A6, anterior left beat. 



PG, posterior left beat. PD, posterior right beat. 



1. 2, 3, 4, order of succession of the beats. Full white lines, curves given by the contact of the 

 right feet; dotted white lines, curves of the contact of the left feet. The curves of the posterior 

 feet are below those of the corresponding anterior. The ascending part of each curve corresponds 

 to a contact ; the descending part to an elevation. The length of the lines of the notation, situated below 

 the tracing, indicates the duration of the contact. The interval between two white lines represents the 

 duration of the elevation of a right member ; the interval between two gray lines represents the duration 

 of the elevation of a left member. 



number 1, the figure will be divided into successive spaces, in which will be 

 found in contact (with the soil) sometimes two members of the same side (lateral 

 biped), sometimes two members situated diagonally. Thus, from 1 to 2 the 

 horse would rest upon the right lateral biped ; from 2 to 3, upon the right diag- 

 onal ; from 3 to 4, upon the lateral left ; from 4 to 5, upon the diagonal left ; 

 finally, from 5 to 6, he would rest, as at the beginning, upon the lateral right 

 (Marey). 



The contact of the body is therefore twice lateral and twice diagonal during 

 the duration of the same step. 



6th. When the animal rests upon a lateral biped, the members of the opposite 

 biped are very close together, for the anterior is raised while the posterior arrives 

 on the ground. It is under these conditions that the hind-foot can meet the fore- 

 foot, if the latter be not raised quickly enough. (See instantaneous photographs.) 



7th. When the animal rests upon a diagonal base, the members of the biped 

 in contact are widely separated, since the anterior is about reaching the ground 

 and the posterior is in the act of rising. Never will the horse, in this case, be 

 exposed to forging or overreaching. (See instantaneous photographs.) 



8th. The lateral base is always very long, the members which form it show- 

 ing themselves, by turns, in a camped attitude. According to M. Lenoble du 

 Teil, it should be 1.65 m. for a horse of 1.60 m. 



9th. The diagonal base is always small, the members which form it being 

 drawn towards each other. According to M. Lenoble du Teil, it should be 

 0.75 m. for a horse of 1.60 m. 



