Sect. XXXIH. i. i. OF SENSATION. 305 



SECT. XXXIIL 



DISEASES OF SENSATION. 



I. 1. Motions excited by fenfation. Digeflion. Generation. Pleaf 

 ure of exigence. Hypochondriacifm. 2. Pain introduced. fen- 

 fitive fevers of two kinds. [13. Two fenforia I powers exerted in 

 fenfitive fevers. Size of the blood. Nervous fevers diflinguifhed 

 from putrid ones. The feptic and antifeptic theory. 4. Two 

 kinds of delirium. 5. Other animals are lefs liable to delirium , 

 cannot receive our contagious difeafes, and are lefs liable to madnefs. 

 II. 1. Sen/it ive motions generated. 2. Inflammation explained. 

 3. Its remote caufes from excefs of irritation , or of 'irritability •, not 

 from thofe pains which are owing to defecl of irritation. New vef- 

 fels produced, and much heat. 4. Purulent matter fecreted. 5. Con- 

 tagien explained. 6. Received but once. *]. If common matter 

 be contagious ? 8. Why fame contagions are received but once. 9. 

 Why others may be received frequently. Contagions of fm all-pox 

 and meafes do not atl at the fame time. Two cafes of fuch pa- 

 tients. 10. The blood from patients in the fmall-pox will not in- 

 feci others. Cafes of children thus inoculated. The variolous con- 

 tagion is not received into the blood. It acJs by fenfitive afjbciation 

 between the flomach andfhin. III. 1. Abforption of folids and 

 fluids. 2. Art of healing ulcers. 3. Mortification' attended 

 with lefs pain in weak people. 



I. 1. As many motions of the body are excited and continu- 

 ed by irritations, fo others require, either conjunctly with thefe, 

 or feparately, the pleafurable or painful fenfations, for the pur- 

 pofe of producing them with due energy. Amongft thefe the 

 bufinefs of digeftion fupplies us with an initance : if the food, 

 which we fwallow, is not attended with agreeable fenfation, it 

 digefts lefs perfectly ; and if very difagreeable fenfation accom- 

 panies it* fuch as a naufeous idea, or very difguftful tafte, the 

 digeftion becomes impeded •, or retrograde motions of the ftom- 

 ach and cefophagus fucceed, and the food is ejected. 



The bufinefs of generation depends fo much on agreeable fen- 

 fation, that, where the object, is difguftful, neither voluntary ex- 

 ertion nor irritation can effect: the purpofe ; which is alfo liable 

 to be interrupted by the pain of fear or baftvfulnefs. 



Befides the pleafure, which attends the irritations produced by 

 the objects of luft and hunger, there feems to be a fum of pleaf- 

 urable affection accompanying the various fecretions of the nu- 

 merous glands, which conftitute the pleafure of life, in ccntrcdif- 



Vol. J. O <i ftnetion 





