PSYCHIC ADAPTATION 91 



due proportion in consciousness, such is the 

 unceasing work being carried on by psychic 

 evolution. 



The cerebral structure is a true product of this 

 relation. The nerves acquire their protoplasmic 

 elongations precisely because, in order to continue 

 this progression of relations, they must keep 

 increasing their collateral elongations and adjusting 

 themselves to external parallelism. 



The form of the neurona is a mechanical conse- 

 quence, in order to produce this parallelism on 

 which the intelligence depends ; the brain is an 

 organ of association, provided it be healthy, so 

 that the series of external phenomena may be 

 repeated in the brain, just as they are in Nature. 

 The power of induction and deduction by which 

 the human intelligence is distinguished resides 

 entirely in the brain, in which the series of internal 

 relations is interwoven and virtually formed, and 

 sometimes one single fact is sufficient to set in 

 motion the whole series of relations to which the 

 fact corresponds. 



All science is a continual demonstration of such 

 correspondence. Copernicus, Galileo, Kepler, were 

 brains which perceived by a direct observation of 

 Nature the series of phenomena by which the 

 movements of the stars are governed, their order 

 of succession, and the persistence of these same 



