4 62 THEORY OF FEVER. Sup. I. 8. 2. 



laftly, this accumulation of the fenforial power of irritation fo 

 far abounds, that it increafes the action of the next link of the 

 aflbciated train or tribe of motions ; thus on expofing the fkin 

 to cold air, as in walking out in a frofty morning, the actions 

 of the ltomach are increafed, and digeftion ftrengthened. 



But where the torpor of fome irritative motion is owing to 

 the previous exhauftion of the fenforial power of irritation by 

 too great itimuKis, the reftoration of it occurs either not at all, 

 or much more ilowly man in the former inftances; thus after 

 intoxication the ftomachjs very flow in recovering its due quan- 

 tity of the fenforial power of irritation, and never fhews any ac- 

 cumulation of it. 



2. When an afTociate motion, as defcribed in the introduc- 

 tion to Clafs IV. 1. 1. acts with lefs energy, the fenforial pow- 

 er of affociation is either not fufficiently excited by the preced- 

 ing fibrous motions ; or it has been expended or exhaufted by 

 the too violent actions of the preceding fibrous motions. In the 

 former cafe there occurs an accumulation of the fenforial power 

 of affociation ; exactly as, where the ufual ftimulus is with- 

 drawn, there occurs an accumulation of the fenforial power of 

 irritation. Thus when the actions of the capillaries of the fkin 

 are diminiflied by immerfion in cold water, the capillaries of the 

 lungs are rendered torpid by the want of the excitement of the 

 fenforial power of aifociation, owing to the leffened actions of the 

 previous fibrous motions, namely, of thofe of the fkin. Never- 

 thelefs as foon as the capillaries of the fkin regain their increafed 

 activity by the accumulation of the fenforial power of irrita- 

 tion, thefe capillaries of the lungs act with greater energy alfo 

 owing to their accumulated fenforial power of affociation. Thefe 

 are inftances of direet fympathy, and conftitute the cold and 

 hot paroxyfms of intermittent fever j or the firil paroxyfm of a 

 continued one. 



3. When the firfl link of a train of aflbciated motions, which 

 is iubject to perpetual action, becomes a confiderable time tor- 

 pid for want of being excited by the previous exertions of the 

 irritative motions, with which it is catenated ; the fenforial 

 power of affociation becomes accumulated in fo great a degree 

 as to affect the fecond link of the train of aflbciated motions, 

 and to excke it into ftronger action. Thus when the ftomach 

 is rendered torpid by contagious matter fwallowed into it mixed 

 with the faliva, the heart and arteries act more feebly -, becaufe 

 the fenforial power of affociation, which ufed to be excited by 

 the fibrous motions of the ftomach, is not now excited *, and in 

 confequence the motions of the heart and arteries act only by 



the 



