$% DISEASES Class I. 2.1. r, 



fuch medicines as promote a greater production of fenforial pow- 

 er in the brain ; as the incitantia, confiding of wine, beer and 

 opium, in fmall repeated quantities ; and fecondly of fuch as 

 fimply ftimulate the arterial and glandular fyftem into their nat- 

 ural actions ; as fmall repeated blifters, fpices and eflential oils. 

 And laftly the forbentia, which contribute to fupply the more 

 permanent ftrength of the fyftem, by promoting the abforption 

 of nourifhment from the ftomach and interlines j and of the fu- 

 perfiuous fluid ? which attends the fecretions. 



SPECIES. 



i . Febrls inirritativa. Inirritative fever. This is the typhus 

 initior, or nervous fever of fome writers \ it is attended with 

 weak pulfe without inflammation, or fymptoms of putridity, as 

 they have been called. When the production of fenforial pow- 

 er in the brain is lefs than ufual, the pulfe becomes quick as well 

 as weak ; and the heart fometimes trembles like the limbs of 

 old age, or of enfeebled drunkards ; and when this force of the 

 contractions of the heart and arteries is diminifhed, the blood 16 

 pufhed on with lefs energy, as well as in lefs quantity, and thence 

 its ftimulus on their fides is diminifhed in a duplicate ratio. In 

 comprefhons of the brain, as in apoplexy, the pulfe becomes 

 flower and fuller ; for in that difeafe, as in natural lleep, the irri- 

 tative motions of the heart and arteries are not diminlfned, voli- 

 tion alone is fufpended or deftroyed. 



If the abforption of the terminations of the veins is not equal- 

 ly impaired with the force of the heart and arteries, the blood is 

 taken up by the veins the inflant it arrives at their extremities ; 

 the capillary vefiels are left empty, and there is lefs refiftance to 

 the current of the blood from the arteries -, hence the pulfe be- 

 comes empty, as well as weak and quick ; the veins of the fkin 

 are fuller than the arteries of it ; and its appearance becomes 

 pale, bluifh, and fhrunk. See Oafs II. i. 3. i. 



When this pulfe perfifls many hours, it conftitutes the febris 

 Inirritativa, or typhus, or nervous fever, of fome writers ; it is 

 attended with little heat, the urine is generally of a natural col- 

 our, though in lefs quantity ; with great proftration of ftrength, 

 and much difturbance of the faculties of the mind. Its imme- 

 diate caufe feems to be a deficient fecretion of the fenforial pow- 

 er from the inaction of the brain ; hence almoft the whole of 

 the fenforial power is expended in the performance of the mo- 

 tions neceffary to life, and little of it can be fpared for the volun- 

 tary actions of the locomotive mufcles, or organs of fenfe, fee 

 Clafs I. 2. 5. 3. Its more remote caufe may be from a paraly- 



i'S 



