164 Instinct and Intelligence 



this way is therefore dumb, not because he is 

 unable to articulate, but because he has no 

 words at his command ; he may still be able 

 to see, feel, and smell, and, as far as possible 

 without the help of words, think and reason. 1 



Dr. J. Shaw Bolton gives an excellent 

 account, in the eighth chapter of his book on 

 " The Brain in Health and Disease," as to the 

 probable mechanism of the cerebral association 

 processes which, in human beings, result in the 

 elaboration of articular language and thought. 

 The employment of words as articulate symbols 

 to express the contents of impressions made on 

 cortical sensori-motor centres must release a 

 form of energy peculiar to human beings 

 which probably tends to aid in the evolution of 

 the psychical elements of their brains. 



1 The Evolution and Functions of Living Purposive Matter, by 

 N. C. Macnamara, p. 140. 



