SECT. XXXIII. i. i. OF SENSATION. 305 



SECT. XXXIIL 



DISEASES OF SENSATION. 



I. i. Motions excited by fenfation. Digeftion. Generation. Pleaf* 

 lire of exigence. Hypochondriacifm. 2. Pain introduced. Sen~ 

 Jitive fevers of two kinds. 3. Two fenforial powers exerted in 

 fenjitive fevers. Size of the blood. Nervous fevers dijiingttifhed 

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

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

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

 II. i. Senjitive motions generated. 2- Inflammation explained. 

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

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

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

 tagion explained. 6. Received but once. 7. If common matter 

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

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

 and meajles do not act at the fame time. Two cafes of fuch pa- 

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

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

 tagion is not received into the blood. It acls by fenfitive ajjociation 

 between the Jlomach and Jkir. . III. I. Abforption of fo lids and 

 fluids, 2. Art of healing ulcers. 3. M.ortif cation attended 

 ivith lefs pain in weak people. 



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

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

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

 pofeof producing them with due energy. Amongft thefe the 

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

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

 digefts lefs perfe&ly; and if very difagreeable fenfation accom- 

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

 digeftion becomes impeded j or retrograde motions of the (lom- 

 ach and oefophagus, 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 effeft the purpofe : which is alfo liable 

 to be interrupted by the pain of fear or bafhfulnefs. 



Befides the pleafure, which attends the irritations produced by 

 the objefts of lull and hunger, there feems to be a fum of pleaf- 

 urable affe&ion accompanying the various fecretions of the nu- 

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



VOL, I. 



