304 DISEASES Sect. XXXII. i r. i. 



digeftion from the want of food, which is termed hunger ; both 

 arife from the inactivity of thole vefTels, which ought to be either 

 perpetually, or at periodical times itimulated into action. See 

 Seel:. XIII. 3. 2. And the fhivering or actions of the fubcuta- 

 neous mufcles, when we are cold, are in confluence of the 

 pain, or voluntary exertion to relieve that pain, and originate 

 from the want of ftimulus, not from the excefs of it. 



In this age of reafon it is not the opinions of others, but the 

 natural phenomena, on which thofe opinions arc founded, 

 which deferve to be canvafTed. And with the fuppofed exig- 

 ence of ghofts or apparitions, witchcraft, vampyrifm, aftrology, 

 animal magnetifm, and American tractors, fuch theories as the 

 above muft vanifh like the fcenery of a dream •, as they con fid 

 of fuch combinations of ideas, as have no prototype or corres- 

 pondent combinations of material objects exifting in nature. 



SECT. 



