82 THE PRINCIPLE OF THE DIRECT Chap. III. 



certain sensations, desires, &c, are still performed under 

 analogous circumstances through mere habit although 

 of no service. We have combinations of this kind, at least 

 in part, in the frantic gestures of rage and in the writh- 

 ings of extreme pain; and, perhaps, in the increased ac- 

 tion of the heart and of the respiratory organs. Even 

 when these and other emotions or sensations are aroused 

 in a very feeble manner, there will still be a tendency to 

 similar actions, owing to the force of long-associated 

 habit; and those actions which are least under voluntary 

 control will generally be longest retained. Our second 

 principle of antithesis has likewise occasionally come into 

 play. 



Finally, so many expressive movements can be ex- 

 plained, as I trust will be seen in the course of this 

 volume, through the three principles which have now 

 been discussed, that we may hope hereafter to see all 

 thus explained, or by closely analogous principles. It is, 

 however, often impossible to decide how much weight 

 ought to be attributed, in each particular case, to one 

 of our principles, and how much to another; and very 

 many points in the theory of Expression remain inex- 

 plicable. 



