ANIMAL LOCOMOTION. 63 



In the Virginian deer (series 683) the right fore limb is "on" 

 and " off" 13. The left fore limb is " on" 9 and " off" 15. The 

 right hind limb is "on" 8 and "off" 16, while the left hind limb 

 is "on" 10 and "off" 14. 



Intervals between the Fore and Hind Si/nchiries. 



The interval is larger in the horse than in the ungulates. It is 

 exceedingly small in the guanaco, series 743, 



The horse may assume the lateral position in the gallop, as is 

 seen in series 632, Fig. 11. In this figure, as well as one in series 

 612, the animal uses the lateral position immediately after reaching 

 the ground. That the assumption does not depend on speed is shown 

 in the canter. In series 616 there is lateral support in twenty-four 

 pictures, in series 617 two in twelve pictures, and in series 619 one 

 in twelve pictures. 



Heteeochieal Gaits. 



The heterochiral gaits embrace the walk, the trot, the rack, and 

 the pace. 



The Walk. 



This gait has been especially studied from the figures of the 

 series of the horse, the buffalo, the ox, the cat, and the raccoon. 



In the study of the walk by the numerical method it is found 

 that in the horse (series 579), while the hind feet are synchronous, 

 the front feet are asynchronous. 



In the horse (series 574) the hind limbs are practically as asyn- 

 chronous as the fore, while synchrony exists in the diagonal be- 

 tween the left hind limb and the right fore limbs. 



In the same series of twenty-four pictures the following is the 

 order of the feet that are "on" and "off:" 



Rh "off" 14, "on" 10. 

 Rf"off" 9, "on" 15. 

 Lh "on" 13, "off" 11. 

 Lf " on" 14, " off" 10. 

 It will be seen that the right hind and the left fore legs are 

 synchronous. 



Series 579. Rh " on" 8, " off" 4. 

 Rf " on" 7, " off" 5. 

 Lh " on" 8, " off" 4. 

 Lf " on" 9, " off" 2. 



