78 PHYSICAL EXPRESSION. 



and often discussed. I think that symmetry 

 of movements, in a physiological sense, indicates 

 equal bilateral movements, movements occurring 

 similarly on either side of the body. The physio- 

 logical importance of symmetry is very different in 

 various parts of the body : the expression indicated 

 by a symmetry of hands is very different from the 

 signification of a symmetry of the face. Here we 

 may stop one minute, again to point out an analogy 

 between conditions of movement and conditions of 

 trophic action. Symmetry of movement and sym- 

 metry of growth and structural development are 

 seen in man in the nutritive organs, lungs, and 

 respiratory movements ; the two halves of the 

 brain in their anatomical structure and the two 

 sets of nerves with organic functions, vagi, phrenics, 

 sympathetics, are fairly symmetrical. 



Asymmetry in man chiefly concerns his higher 

 functions ; it is seen in his movements in writing, 

 and other high-class hand-work. Speech is not 

 equally represented in either hemisphere of the 

 brain. Some passions are expressed asymmetrically 

 in the face. Evolution is often expressed in plants 

 by asymmetry of growth (see chap. ii.). 



Classification follows' naturally after analysis. I 

 have purposely omitted to consider all the means of 

 analysis of movements, as such might prove weari- 

 some, and is hardly necessary to clear views on the 

 general subject of this work, " The Modes of Expres- 

 sion." For the same reasons our notice of classifica- 

 tion will be but brief, but both analysis and classi- 

 fication will be abundantly illustrated in succeeding 



