NORMAL AND ABNORMAL MOVEMENTS. 



117 



In the other leg the spastic condition, though present, was not 

 so much marked. (See Fig. 10.) It is here noticed that the foot is 

 raised clearly off the ground, and that the leg is flexed, and yet 

 neither of these factors is as marked as we find it in the normal 

 condition. 



The trajectories were determined, and are represented in Figs. 

 13 and 14. 



The amount and direction of the lateral sway of each foot was 

 determined by the use of a transparent scale corrected for per- 

 spective for each position of the foot. The external malleolus was 

 the point used in making each measurement. (See Fig. 11, Nos. 

 1 to 12, and Fig. 12, Nos. 1 to 12.) 



fto. n 



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Lateral sclerosis, left foot. 

 Rise and fall (line «) and lateral swaj' (line 6) of left foot. 



In Fig. 13 the upper line, a, shows the rise and fall and onward 

 movement of the foot, whilst the lower line, h, shows the amount 

 and direction of the lateral sway. 



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L;iteral si.'lerujis, ligli t tVnjt. 

 Riss and fall (line c) and lateral sway (line d) of right foot. 



In Fig. 14 the lines c and d represent the same factors of the 

 right foot. It is noticed in the left foot that the rise and fall as 

 well as the lateral sway are very small. It will be remembered 

 that the left leg was the one most diseased. It was typically 



