v.] " MODERN SYMPOSIUM.'* 73 



that friction-electricity is a product of sensible motion. 

 Instead of entering into the dynamic circuit of corre- 

 lated physical motions, the phenomena of conscious- 

 ness stand outside as utterly alien and disparate 

 phenomena. They stand outside, but uniformly 

 parallel to that segment of the circuit which consists 

 of neural undulations. The relation between what 

 goes on in consciousness and what goes on simul- 

 taneously in the nervous system may best be de- 

 scribed as a relation of uniform concomitance. I agree 

 with Professor Huxley and Mr. Harrison that along 

 with every act of consciousness there goes a molecu- 

 lar change in the substance of the brain, involving a 

 waste of tissue. This is not materialism, nor does it 

 alter a whit the position in which we were left by 

 common-sense before nervous physiology was ever 

 heard of. Everybody knows that, so long as we live 

 on the earth, the activity of mind as a whole is ac- 

 companied by the activity of brain as a whole. 

 What nervous physiology teaches is simply that each 

 particular mental act is accompanied by a particular 

 cerebral act. In proving this, the two sets of pheno- 

 mena, mental and physical, are reduced each to its 

 lowest terms, but not a step is taken toward confound- 

 ing the one step with the other. On the contrary, 

 the keener our analysis, the more clearly does it 



