228 The Evolution Hypothesis. 



interval. How in this instance does the knowledge 

 of relation arise ? " The requisite to the existence of 

 a relation is the occurrence of a change the passage 

 from one apparently-uniform state to another appa- 

 rently-uniform state, implying the momentary shock 

 produced by the commencement of a new state." * 



The relation is " itself a kind of feeling," and we 

 are necessitated to ask, How does this " kind of feel- 

 ing " arise ? It is not accounted for by either of 

 the related feelings. The first cannot yield it ; for 

 the first has just passed away: the second will not 

 yield it; for the second cannot give the transition to 

 itself from the first. We shall look in vain to the 

 organism. It can only furnish a new wave of mole- 

 cular motion with its inner face of feeling: a third 

 feeling then comes into view, and the relation of this 

 third feeling to the original pair augments the com- 

 plexity. The new feeling cannot intervene between 

 the other two ; for they are assumed to be contiguous : 

 it must come after the second ; but to compare it with 

 the second presents all the difficulties involved in com- 

 parison of the second with the first, and enhances the 

 perplexity ; for we have then to compare it with the 

 first through the second. A third shock is added, and 

 the complication is increased. 



Another supposition is conceivable : the initial part 

 of the second feeling may be the feeling required. 



* Psychology, Vol. I., 67. 



