PROGRESSIVE MOTION IN QUADRUPEDS. 495 



each set of feet taken diagonally ; that is, by the 

 right fore foot, and the left hind foot ; or, vice 

 versa, the one set being raised together a short 

 time before the others have reached the ground : 

 so that during that minute interval of time all 

 the feet are in the air at the same moment ; and 

 during the remaining portion of the time, the 

 body is resting upon the two feet placed diago- 

 nally with regard to each other. The undula- 

 tions are here chiefly vertical, instead of lateral, 

 as they are in the walking pace. 



A gallop is a continued succession of longer 

 leaps made by the two hind feet in conjunction. 

 In this case, the centre of gravity is lifted higher 

 from the ground, and is projected in a wide arch, 

 and with great velocity. 



In the amble, both the legs on one side are 

 raised together ; so that the impulsions given are 

 directed much more laterally than in any other 

 pace, and the body is thrown into a strong undur 

 latoiy motion from side to side. 



Another kind of pace is the bound, which is 

 often practised by deer, and is performed by 

 striking the ground with all the legs at the same 

 moment. It consists, therefore, like the gallop^ 

 of a series of leaps ; but their direction is more 

 uniformly upwards, from the concurrence of all 

 the legs in the same action. 



Nature has purposely endowed different tribes 

 with very different capacities to execute pro- 



