LOCOMOTION IN MAN 173 



phase of the movement in which they take part. The 

 standing out of muscles in action has, so to speak, 

 an individual expression, just as is the case with the 

 facial muscles, and if most subtle physiological know- 

 ledge could be applied in all cases, it might be said 

 that the modelling of a limb could not only express 

 the action of the time being, but could suggest to 

 a certain extent its immediate successor. 



Some interesting experiments of M. Demeny show 



Fitr. 113.— ChLoiiopliotu^rapLiic illustration of a runuer. 



that the extension of an arm in striking, if it is to be 

 complete, must be accompanied by the total relaxation 

 of the flexor muscles. The latter muscles, however, 

 come into play, if the movement of extension is to be 

 arrested. As, for instance, in the case of a man 

 preparing to strike, without the actual intention of 

 delivering the blow. 



In the four following figures, the expression of the 

 outstanding muscles varies according to the nature of 

 the preceding movement, although the final attitude 

 13 



