CHAPTER XIII 



RELATION TO THE OUTER AND INNER 

 WORLDS BY THE SENSES 



124. WHEN we reflect on the physiological 

 nature of the senses, we find that the mind 

 becomes cognizant of two worlds from which 

 apparently come streams of feeling. There is 

 in the first place the inner world of our own 

 body in which there are physiological opera- 

 tions constantly going on, such as have been 

 indicated in the previous pages. Of some 

 of these operations we are more or less con- 

 scious, while many others, and probably by 

 far the greater number, never rise to the level 

 of consciousness even although nervous im- 

 pulses from many organs and tissues may reach 

 the higher centres. But we have what may be 

 termed internal senses, such as hunger and 

 thirst, satiety, the feeling of easy and com- 

 fortable respiration, as when we breathe fresh 



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