LECTURE II. 71 



duce no bad effect upon one person, will 

 have a detrimental influence upon another, 

 and this we say is the result of idiosyn- 

 crasy. Thus the odour of a cat, or the 

 effluvia of mutton, the one imperceptible, 

 the other grateful to the generality of 

 persons, has caused individuals to fall 

 on the ground as though bereaved of 

 life, or to have their whole frame agi- 

 tated by convulsions. Substances which 

 induce disease in one person or animal, 

 do not induce disease in others. That 

 pain is not the cause of action, is I 

 think evident. Nervous motions, induced 

 by the will, cause our muscles to act, but 

 such motions occasion no sensation in 

 the obedient muscles. When, therefore, 

 we employ the terms in common use of 

 a stimulus being applied, and an action or 

 disease excited, we should remember that 

 neither the infliction of pain, nor absolute 

 injury, is essential to the production of such 

 consequences. 



With respect to the second proposition, 

 into which I have resolved the objections 



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