74 PHYSICAL EXPKESSIOX. 



indicating the movements of the trunk in walking- 

 as resulting from the movements of the limbs, 

 i.e. he describes the movements of the trunk as 

 moved by the limbs, as moved by the muscles, as 

 stimulated by the nerve-centres. If movements 

 occur in a subject it is implied that the parts of that 

 subject can move more or less independently of one 

 another. When we say a man's limbs move, it is 

 implied that his limbs are movable. If a billiard- 

 ball upon a table is struck and moves in conse- 

 quence, the ball as a whole travels, the movement 

 that follows is that of the whole ball. In speaking of 

 movement it is, then, necessary to be clear whether 

 we are speaking of movement of the object as a 

 whole, as when we speak of the movements of the 

 moon, or whether we mean movements of the parts 

 of the object, as movement of the limbs of an 

 animal. It often happens that a certain movement 

 that is observed, is the movement of an aggregation 

 of independent individuals. Such is seen in a pro- 

 cession of men assembled for a political purpose. 

 The movement of the whole procession is an aggre- 

 gation of the actions of a number of separate men, 

 held together and governed for the time by a common 

 political object ; there is no structural union between 

 them : and in such a case the coincidence of their 

 movements is an expression of the bond of union. 

 The movements of such an aggregation are often 

 highly expressive, the more so from the fact that 

 there is no organic union between the individuals. 

 The movements of an army corps are more expres- 

 sive than the movements of a gang of slaves chained 



