OF VITAL MOTION. 127 



reason for supposing the nervous influence to be a 

 variety of cosmical force. 



It has been shown, also, in the same work that all 

 forms of physical and vital force are truly corre- 

 lative : and hence a final argument in favour of the 

 view that the nervous influence is a variety of 

 cosmical force. 



We are not taught, however, by these considera- 

 tions to do away with the idea of nervous influence, 

 though we regard it in this point of view, or to 

 ascribe its workings to electricity, or heat, or light, 

 any more than we should confound the existence of 

 light, or heat, or electricity, and say that either of 

 these agents was identical with the others. Corre- 

 lation, in fact, involves the idea of unity, but it as 

 distinctly retains that of difference. Nor are we to 

 confound nervous influence with mind, for if it be 

 as we have said it is clear that it can have no 

 exclusive claim to be considered as identical with this 

 essence. 



The nervous influence, therefore, is to be regarded 

 as one of several modes of cosmical force, which reacts 

 harmoniously with all companion agencies, in the 

 determination of vital movement. 



