GLASS IV. 2. 2. 1. OP ASSOCIATION. 413 



SPECIES. 



1. Torpor genm a dolore denlis. In tooth-ache there is general- 

 ly a coldness of the cheek, which is sensible to the hand, and is 

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

 tooth have frequently been engaged in pleasurable action at the 

 same time during the masticating of our food; whence they 

 have acquired sensitive associations. The torpor of the cheek 

 may have for its cause the too great expenditure of sensorial 

 power by the painful sensation of the membranes of the diseas- 

 ed tooth; whence the membranes of the cheek associated with 

 those of the alveolar process are deprived of their natural share 

 of it, and become torpid; thus they produce less secretions, and 

 less heat, and the pain of cold is the consequence. This torpor 

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

 of the sensorial power of sensation; for then they would act 

 more violently than natural, or become inflamed. And though 

 the pain by exhausting so much sensorial power may be a re- 

 mote cause, it is the defect of the power of association, which 

 is the immediate cause of the torpor of the cheek. 



After some hours this pain occasioned by the torpor of the 

 vessels of the cheek either gradually ceases along with the pain- 

 of the diseased tooth; or, by the accumulation of sensorial pow- 

 er during their state of torpor, the capillaries of the cheek act 

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

 and consequent tumour, and inflammation. In this state the 

 pain of the diseased tooth ceases; as the sensorial power of sen- 

 sation is now expended on the inflamed vessels of the cheek. It 

 is probable that most other internal membranous inflammations 

 begin in a similar manner; whence there may seem to be a double 

 kind of sensitive association; first, with decreased action of the 

 associated organ, and then with increased action of it; but the 

 latter is in this case simply the consequence of the former; that 

 is, the tumor or inflammation of the cheek is in consequence 

 of its previous quiescence or torpor. 



2. Stranguria a dolore vesiccv. The strangury, which has its 

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

 the external extremity of the urethra or of the glans penis of 

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

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

 these with some distant parts, generally with the other end of 

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

 tends this pain. 



Its remote cause is from the internal or external use of can- 

 X tharides 5 which stimulate the neck of the bladder; or from a 



