3 o2 DISEASES SECT. XXXII. i. j. 



not much fubjecl either to irritation or to other kinds of afib- 

 ciations befides the voluntary ones, except indeed when they 

 are excited by the lafh of ilavery. 



In thefe vafcular mufcles, which are fubjecl to perpetual ac- 

 tion, and thence liable to great accumulation of fenforial power 

 during their quiefcence from want of ftimulus, a great increafe 

 of activity occurs, either from the renewal of their accuftomed 

 ftimulus, or even from much lefs quantities of ftimulus than ufu- 

 al. This increafe of aclion conflitutes the hoc fit of fever, 

 which is attended with various increased fecretions, with great 

 concomitant heat, and general uneafmefs. The uneafinefs at- 

 tending this hot paroxyfm of fever, or fit of exertion, is very dif- 

 ferent from that, which attends the previous cold fit, or fit of 

 quiefcence, and is frequently the caufe of inflammation, as in 

 pleurify, which is treated of in the next feel ion. 



A fimilar effecl occurs after the quiefcence of our organs of 

 fenfe j thofe which are not fubjecl to perpetual aclion, as the 

 taiie and fmell, are lefs liable to an exuberant accumulation of 

 fenforial power after their having for a time been maftive ; but 

 the eye, which is in perpetual aclion during the day, becomes 

 dazzled, and liable to inflammation after a temporary quiefcence. 



Where the previous quiefcence has been owing to a defecl of 

 fenforial power, and not to a defecl of iiimulus, as in the irrita- 

 tive fever with weak pulfe, a fimilar increafe of activity of the 

 arterial fyftem fucceeds, either from the uiual ftimulus of the 

 blood, or from a ftimulus lefs than ufual \ but as there is in 

 general in thefe cafes of fever with weak pulfe a deficiency of 

 the quantity of the blood, the pulfe in the hot fit is weaker than 

 in health, though it is ftronger than in the cold fit, as explained 

 in No 2. of this fettion. But at the fame time in thofe fevers, 

 where rhe defect of irritation is owing to the defect of the 

 quantity of fenforial power, as well as to the defecl of ftimulus, 

 another circumftance occurs \ which confifts in the partial dif- 

 tribution of it, as appears in partial fluihings, as of the face or 

 bolom, while the extremities are cold ; and in the increafe of 

 particular fecretions, as of bile, faliva, infenfible perfpiration, 

 with great heat of the fkin, or with partial fweats, or diarrhoea. 



There are alfo many uneafy fenfations attending thefe in- 

 creafed aclions v which like thofe belonging to the hot fit of fe- 

 ver with ftrong pulfe, are frequently followed by inflammation, 

 as in fcariet fever ; which inflammation is neverthelefs accom- 

 pained with a pulfe weaker, though quicker, than the pulfe du- 

 ring the remiffion or intermiflion of rhe paroxyfms, though 

 ftronger than that of the previous cold fit. 



From hence I conclude, that both the cold and hot fits of fe- 

 ver 



