28 



ZOOPRAXOORAPH Y 



its lateral inferior limb. This is proved not merely 

 by the ordinary quadrupedal walk, but by the sus- 

 pended motion of the sloth; the crawling of the child 

 upon the ground, the erect walk of man; and the in- 

 verse limb movements of the ape tribe. 



The relative time intervals of the foot-fallings vary 

 greatly with many species of animals, and even with 

 the same animal under different conditions. 



Selecting the horse for the purpose of illustration 

 we find that during the walk — his slowest progressive 

 movement — he has always two, and for a varying 

 period of time, or distance, three feet on the ground 

 at once, while during a very slow walk the support 

 will devolve alternately upon three feet and upon four 

 feet. 



If the notation of the foot-fallings commences 

 with the landing of the right hind foot, the order in 



SOME CONSECUTIVE PHASES OF THE WALK. 



