PSYCHIC ADAPTATION 89 



transformation when psychology, familiar with these 

 genealogical facts, adopts them as the basis of its 

 studies. 11 



In dealing with the law of intelligence, Spencer 

 states : " A correspondence between the internal 

 and external order implies that the relation 

 between two states of consciousness answers to 

 the same relation as exists between the two 

 external phenomena that have originated it. How 

 is this correspondence produced ? The two states 

 of consciousness are produced in succession, and 

 all the successions are similar, considered as such. 

 In what, then, will the correspondence consist ? It 

 consists in this : that the persistence of connection 

 between the two states of consciousness is in pro- 

 portion to the persistence of the connection 

 between the two external phenomena to which 

 they correspond. The relations between the 

 external phenomena undergo all gradations from 

 the absolutely necessary to the merely accidental. 

 The relations between the corresponding states of 

 consciousness must consequently undergo the same 

 gradations in all respects. When the correspond- 

 ence is complete, that is, when it has reached its 

 greatest perfection, the various gradations of the 

 one must each time more closely approximate the 

 various gradations of the other." 



The inference is that the intelligence is a repro- 



