44$ DISEASES OF SENSATION. SECT. XXXIII. t. 



conjundly with thefe, or feparately, the pleafurable 

 or painful fenfations, for the purpofe of producing 

 them with due energy. Amonglt ihefe the bufinefs 

 of digeition fupplies us with an inftance ; if the 

 food, which we Swallow, is not attended with agree- 

 ably fenfation, it digefts lefs perfectly ; and if very 

 difagreeable fenfation accompanies it, fuch as a nau- 

 feous idea, or very difguflful tafte, the digeflion be- 

 comes impeded ; or retrograde motions of the fto- 

 ipach and cefophagus fucceed, and the food is, 



The bufinefs of generation depends fo much on 

 agreeable fenfation, that, where the object is diC 

 guit-ul, neither voluntary exertion nor irritation can 

 effedi the purpofe ; which is alfo liable to be inter- 

 rupted by the pain of fear or bafhfijlnefs. 



Befides the pleasure, which attends the irritations 

 produced by the objeds pf luil and hunger, there 

 feems to be a fum of pleafurable affection accompa- 

 nying the various fecretions of the numerous glands, 

 which conftitute the pleafure of life, in contradif- 

 tincuon to the tsedjum vitse. This quantity or fum 

 of pleafurable affe&ion feems to contribute to the 

 due or energetic performance of the whole move- 

 |ible tyftem, as well that of the heart and arteries, 

 as of digeflion and of abforption ; fince without 

 fhe due quantity of pleafurable fenfation, flatulen- 

 cy and hypochondriacifrn affedt the inteftines, and 

 a languor feizes the arterial pt^lfations and fecreti- 

 ons ; as occurs in great and continued anxiety of the 

 mind. 



2. Betides the febrile motions occafioned by irrita- 

 tion, defcribed in Seel:. XXXII. and termed irritative 

 fever, it frequently happens that pain is excited by 

 the violence of the fibrous contractions ; and other 

 new motions are then fuperadded, in confequence, 

 of fenfation, which we (hall term febris fenfitiva, or 

 ienfitive fever* It mull be obferved, that moil i t "- 



ritative 



