CLASS IV. 2. 2. i. OF ASSOCIATION. 413 



SPECIES. 



1. Torpor gerix a dolor e dent'is. In tooth-ach there is general- 

 ly a coldneis of the cheek, which is fenfible to the hand, and is 

 attended in fome degree with the pain of cold. The cheek and 

 tooth have frequently been engaged in pleafurable action at the 

 fame time during the mafticating of our food ; whence they 

 have acquired fenfitive aflbciations. The torpor of the cheek 

 may have for its caufe the too great expenditure of fenforial 

 power by the painful fenfation of the membranes of the difeaf- 

 ed tooth ; whence the membranes of the cheek aiTociated with 

 thofe of the alveolar procefs are deprived of their natural (hare 

 of it, and become torpid ; thus they produce lefs fecretions, and 

 lefs heat, and the pain of cold is the confequeiice. This torpor 

 of the veffels of the cheek cannot be produced by the activity 

 of the fenforial power of fenfation ; for then they would act 

 more violently than natural, or become inflamed. And though 

 the pain by exhauiting fo much fenforial power may be a re- 

 mote caufe, it is the defed; of the power of affociation, which 

 is the immediate caufe of the torpor of the cheek. 



After fome hours this pain occafioncd by the torpor of the 

 vefiels of the cheek either gradually ceaies along with the pain 

 of the difeafed tooth ; or, by the accumulation of fenforial pow- 

 er during their (late of torpor, the capillaries of the cheek act: 

 with greater violence, and produce more fecretions, and heat, 

 and confequent tumour, and inflammation. In this ftate the 

 pain of the difeafed tooth ceafes , as the fenfovial power of fen- 

 fation is now expended on the inflamed veffels of the cheek. It 

 is probable that mod other internal membranous inflammations 

 begin in a fnnilar manner ; whence there may feem to be a double 

 kind of fenfitive aiTociation ; firft, with decreafed action of the 

 aflbciated organ, and then with increafed action of it j but the 

 latter is in this cafe fimply the confequence of the former ; that 

 is, the tumour or inflammation of the cheek is in confequence 

 of its previous quiefcence or torpor. 



2. Stranguria a dolore vefica. The ftrangury, which has its 

 origin from pain at the neck of the bladder, confifts of a pain in 

 the external extremity of the urethra or of the glands penis of 

 men, and probably in the external termination of the urethra or 

 of the clitoris of women ; and is owing to the fympathy of 

 thefe with fome diftant parts, generally with the other end of 

 the urethra ; an endeavour and difficulty of making water at- 

 tends this pain. 



Its remote caufe is from the internal or external life of can- 

 tharides, which ftimulate the neck of the bladder ; or from a 



ft one. 



