CusACK — Human Locomotion. 531 



I have s'ubstracted the ordinates, so that it can be clearly seen 

 how they repeat themselves for each alternate step. Between 3 TSO 

 and 35-25 it will be noticed that the velocity was lower than it ought 

 to have been; this presiimably was due to the walker having slipped, 

 or more likely to a fault in the apparatus, such as a slight jerk. 

 I noticed that the same thing happened in several cases, and it is 

 more likely due to the apparatus than to the walker. It will also 

 be seen that the variation for the two feet is not the same. By 

 glancing at the curves it will be seen that the velocity is at a maxi- 

 mum shortly after the heel is placed on the ground, and diminishes 

 then until the other heel has nearly reached the ground. The velocity 

 decreases more rapidly than it increases, especially in the case of 

 the curve B, where it will be seen that velocity increases very 

 slowly almost from the time the heel of one foot is removed from 

 the ground until the heel of the other foot is about half-way over 

 its course — there the velocity is at a maximum. It then suddenly 

 falls off for about two-ninths of a step, the heel being raised from 

 the ground about half through this period of decrease, that is to say, 

 about one-ninth of a step from the time when the velocity has a 

 maximum. Thus it will be seen that in the case of the curve B the 

 velocity was increasing during seven-ninths of a step and diminishing 

 during two-ninths. It will be seen that in both the other curves 

 shown, the time of increase is only slightly greater than that of decrease. 



The velocity, as will be seen from the curves, varies very uni- 

 formly, the least variation obtained was 12*5 per cent, from the mean, 

 while the greatest variation was over 26 per cent, from the mean. 

 These were extreme cases, and out of 27 individuals whose velocity 

 was recorded 23 varied from 16 to 18 per cent. 



The following are the variations from the mean of each individual 

 whose walk was recorded : — 



12-5 



16-2 



17-9 



14-7 



16-3 



17-9 



15-2 



16-6 



18-0 



15-8 



16-7 



18-0 



16-0 



17-2 



18-1 



16-0 



17-6 



18-7 



16-1 



17-6 



19-9 



16-1 



17-7 



22-6 



16-1 



17-9 



26-2 



All of these individuals had 8 and some 12 records taken of their 



E.I.A. PEOC, SEE. ni-, VOL. IV. 2 P 



