224 The Evolution Hypothesis. 



compounding and recompounding the proposed unit 

 will yield a body of intellection corresponding with 

 reality. 



Even though the pulse of feeling could be shown to 

 answer in every case to a nerve-pulse, even though 

 it were granted that they are inner and outer faces of 

 the same, Mr. Spencer's attempt to find a unit of con- 

 sciousness in the pulse of feeling fails : it is not the 

 pulse of feeling, but the consciousness of it, with 

 which he must set out. 



But we deny that " nerve pulses and pulses of feel- 

 ing clearly answer to one another," as " inner and outer 

 faces of the same." The correspondence of mind and. 

 body is a commonplace of psychology in all schools. 

 That nerve-action and feeling correspond is proved 

 Jin every twinge of toothache. But that the corres- 

 pondence is that of the outer and inner faces of the 

 same thing is not proved : on the contrary, there is 

 grave doubt of its truth. If the nerve-thrill and the 

 feeling are two sides of the same they should invari- 

 ably exist together : where the outside is discovered 

 the inside should be found with it. But this is not 

 the case. Thrills of nerve-change pass through the 

 nerve-centres often, and no feeling answers them. 

 The outer face is there, while the inner face is want- 

 ing. The nerve-thrill has no counterpart in feeling 

 unless we are conscious of it. Consciousness is, then,, 

 the characteristic element in this instance. It is not a 

 wave of molecular motion, but knowing to which we- 



