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following facts. If a nerve be irritated 

 midway between the brain and its ex- 

 tremities; severe pain is supposed to be 

 felt in those extremities; and if it sup- 

 plies muscles, those muscles become con- 

 vulsed. Thus when a disease forms about 

 the hip joint, or in the loins, many per- 

 sons have applied poultices to their knees, 

 from a conviction that as the pain was felt 

 in the knee, it was the seat of the disorder. 

 In like manner, persons who have had 

 their limbs amputated, can scarcely be- 

 lieve that they are removed, because of 

 the pain and other sensations they still 

 seem to feel in them. In either of these 

 cases, motions being excited in the mid- 

 dle of nerves, and transmitted to the brain, 

 are attributed to a disordered state of 

 those parts from which such motions have 

 heretofore originated. 



If then it be admitted that sensation 



F2 



