Experiments and their Verification 191 



towards the toe. If, however, the heel is arrested suddenly or sinks 

 too far into the ground, the ankle will go over as before. It seems as 

 if the suspending ligaments have lost their power to keep the ankle 

 joint in position long enough to allow the backward extension to be 

 finished before the foot is again lifted for another stride. 



foes 



so* 



beve/led on oufsicfe. +0 

 knee hitting . 



II 



"heel 



near hind: we.l> 

 Extensions 



FIG. 149 



of-nh =3.58 



diff - .24-fl- 

 or 2.88 in. 



average - 3.46 f-h 

 Stride - 15.5 ft 



It should be noted that the distance between the exrremities is con- 

 siderably less in this trial (3.46 ft), as compared with that of previous 

 trial (3.88 ft.), when the stride averaged 15.8 ft., or only 0.3 ft. more 

 than the present stride of 15.5 ft. This difference is about 5 in. (0.42 

 ft.), and shows the greater approach of the extremities by the influ- 

 ence of greater weight and longer toes behind. Looking at the varia- 



