500 THE EXTERIOR OF THE HORSE. 



All the marched gaits being related to the amble, M. Duval first designed sixteen horses (this 

 number suffices) in the different phases of the latter. These reproductions are disposed in two 

 superposed sheets of paper. The upper is fenestrated in such a manner that one-half of each 

 horse is visible on this sheet and the other half on the lower. The hind -quarters, for example, 

 being on the upper sheet, the fore-quarters are placed upon the lower, and are visible through 

 the openings made in the latter. Suppose, now, that the superior sheet be moved so that an 

 interval separates two figures of the horse, and we will have a series of images in which the 

 anterior members are tardy in point of time upon the posterior, as takes place in the broken 

 amble. If the gliding of the sheet be increased, we have the series of attitudes of the walk ; 

 a still further gliding will give those of the trot. 1 



6th. Reproduction of the Notations. Estimating that the marched 

 gaits of the horse can be classed in a natural series whose first term is the 

 amble, and in which the difference between a given gait and the following con- 

 sists in a quickness or a slowness of the posterior members, according as he accel- 

 erates or slackens his movement, M. Marey has invented a model, valuable both 

 for artists and demonstrators, by means of which it is easy to construct the nota- 

 tion of such or such a variation of gait, even to reproduce voluntarily the forms 

 of locomotion now unknown, which are perhaps employed by certain savage spe- 

 cies whose mode of progression has not been analyzed. 



The model for notation of the gaits 2 consists of a small black-board (Fig. 190) 

 along which can glide four small flat reglets, alternately black and white or gray 

 and black, and placed two by two. 



FIG. 190. 



As each of these blocks is independent, it is easy to juxtaposit or alternate 

 in several ways the white segments (contacts) and the dark segments (elevations). 

 The notation of any marched gait whatever can thus be constructed very 

 rapidly. 



In Fig. 190, for example, have been arranged alternately the light blocks and the black 

 blocks in both the superior and the inferior reglets. Then the latter have been moved towards 

 the left without changing their relations. In this manner one variety of walk can be obtained. 

 If the posterior left beat is produced opposite to the numbers 1, 2, 3, 4, etc., so many different 

 varieties will thus be the result. 



In Fig. 191 the blank blocks are semi-superposed in each series of reglets. The inferior series 

 is so disposed as to make the beat of the anterior right coincide with the posterior left. The 

 result is a notation corresponding to one variety of gallop, 



But the model, thus constructed, is not applicable to the notations of the 

 leaping gaits, in which intervene the phases of suspension during which no foot 

 touches the ground. 



1 See Marey, loc. cit., p. 184. 2 Marey, loc. cit. 



