THE LEAP 43 



No attempt will be iiuide to laialyze the consecutive 

 phases of various other acts of Animal Locomotion, 

 such as rearing, bucking, kicking, tossing, etc., on 

 account of the irregularity which characterizes their 

 execution, and the difficulty of obtaining reliable data. 



The Author has vainly sought for the rules which 

 govern the hind feet of a playfully disposed mule; but 

 the inquiry has usually been unsatisfactory, and upon 

 some occasions disastrous. Should these movements 

 be controlled by any general law, it is of such a com- 

 plex nature that all attempts to expound it have 

 hitherto been fruitless. 



The figures in the series of circles (see appendix 

 A) were selected from 



^ ' ANIMAL LOCOMOTION ' ' 



and arranged by the Author for his less ambitious work, 



^ ^ POPULAR ZOOPRAXOGRAPHY. ' ' 



(See Appendix C). 



They were traced by the well known artist, Erwin 

 Faber, and are reproduced one-third the diameter of 

 the circles arranged for the zoopraxiscope. Many of 

 the original phases of movement are omitted on ac- 

 count of the optical law which in the construction of a 

 zoopraxiscope requires that the number of illustrations 

 must bear a certain relationship to the number of 

 perforations through which they are viewed. 



The popular number of thirteen having been 

 selected for the latter, the same number of figures 

 illustrate actions without lateral progressive motion. 



When the number of illustrated phases is less 

 than the number of perforations, the succession of 



