THE GENERAL SENSES. 277 



shown by the fact that they are permanently relieved by 

 introducing food and water into the body (by the rectum, 

 for instance), in which case the throat and stomach have 

 nothing given them directly. Since, however, food and 

 drink naturally enter by the throat and stomach, the 

 mucous membrane of these organs has become spokes- 

 man of the body for its demands. 



READING. Pain, Corning. 



Summary. i . Brain action depends, in the long run, upon im- 

 pulses from without. If we had no impressions, we could have no 

 expressions* 



2. General sensations are referred to our bodies and their condition ; 

 special sensations are regarded as attributes of external objects. 



3. The "muscular sense" probably depends chiefly on impulses 

 from the tendons and joints. 



4. The muscular sense is necessary for the full interpretation of 

 sight. It enables us to judge of the degree of effort put forth or force 

 resisted. 



5. Pain is a general sensation. It is a warning the cry of a senti- 

 nel that an enemy has passed the picket line. 



6. Hunger and thirst indicate the need of food and drink. They are 

 local signals of a general want. 



Questions. I. If we had no sense of pain, what might result? 

 2. If we pass by a meal time without eating, why does the sense of 

 hunger disappear? 



