462 THEORY OF FEVER. SUP. I. 8. 2. 



lastly, this accumulation of the sensorial power of irritation so 

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

 associated train or tribe of motions; thus on exposing the skin 

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

 of the stomach are increased, and digestion strengthened. 



But where the torpor of some irritative motion is owing to 

 the previous exhaustion of the sensorial power of irritation by 

 too great stimulus, the restoration of it occurs either not at all, 

 or much more slowly than in the former instances; thus after 

 intoxication the stomach is very slow in recovering its due quan- 

 tity of the sensorial power of irritation, and never shews any ac- 

 cumulation of it. 



2 When an associate motion, as described in the introduc- 

 tion to class IV. 1. 1. acts with less energy, the sensorial power 

 of association is either not sufficiently excited by the preced- 

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

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

 former case there occurs an accumulation of the sensorial power 

 of association; exactly, as, where the usual stimulus is with- 

 drawn, there occurs an accumulation of the sensorial power of 

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

 are diminished by immersion in cold water, the capillaries of the 

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

 sensorial power of association, owing to the lessened actions of the 

 previous fibrous motions, namely, of those of the skin. Never- 

 theless as soon as the capillaries of the skin regain their increased 

 activity by the accumulation of the sensorial power of irrita- 

 tion, these capillaries of the lungs act with greater energy also 

 owing to their accumulated sensorial power of association. These 

 are instances of direct sympathy, and constitute the cold and 

 hot paroxysms of intermittent fever; or the first paroxysm of a 

 continued one. 



3. When the first link of a train of associated motions, which 

 is subject to perpetual action, becomes a considerable time tor- 

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

 irritative motions, with which it is catenated; the sensorial 

 power of association becomes accumulated in so great a degree 

 as to affect the second link of the train of associated motions, 

 and to excite it into stronger action. Thus when the stomach 

 is rendered torpid by contagious matter swallowed into it mixed 

 with the saliva, the heart and arteries act more feebly; because 

 the sensorial power of association, which used to be excited by 

 the fibrous motions of the stomach, is not now excited; and in 

 consequence the motions of the heart and arteries act only by 



