CHAPTER IX 



THE LAW OF SENSATION AND THE NERVOUS 

 SYSTEM OF MAN 



The dominance of the mind of man and its out- 

 standing significance in his Hfe make it difficult 

 for us to analyze it in relation to the other basal 

 laws of protoplasm. The human mind is able to 

 take advantage of all discoveries of all past 

 epochs. Such vast powers overshadow the more 

 elemental features and obscure the relations 

 which the mind of man bears to animals. 



The law of sensation deals with the several 

 structures that are modified to respond to stimuli 

 and the reactions which they incite. The funda- 

 mental features of this problem are the same in 

 all animals. Man gains his information in just 

 the same manner as the other higher animals and 

 through the same avenues. There is nothing 

 unique or peculiar about man. By means of 

 this law all animals regulate their several 

 organ systems and adjust themselves to their en- 

 vironment. 



This feature of protoplasm is nevertheless 

 governed by laws and acts within prescribed 



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