44* DISEASES OF IRRITATION. SECT. XXXII. 9. 



veflels of the fkin, for the purpofe of fupplying the 

 fluid expended in perfpi ration. 



The pulfe becomes itrong and full, owing to the 

 increafed irritability of the heart and arteries, from 

 the accumulation of fen fo rial power during their 

 quiefcence, and to the quicknefs of the return of 

 the blood from the various glands and capillaries. 

 This increafed action of all the fecretory . veflels 

 does not oecur veiy fuddenly, nor univerfally at 

 the fame time. The heat feems to begin about the 

 center, and to be diffufed from thence irregularly 

 to the other parts of the fyflem. This may be 

 owing to the fituation of the parts which firft be- 

 came quiefcent and caufed the fever-fit, efpecially 

 when a hardnefs of tumour about the praecordia 

 can be felt by the hand ; and hence this part, in 

 whatever vifctis it is feated, might be the firfl to 

 regain its natural or increafed irritability. 



3. It mud be here noted, that, by the increafed 

 quantity of heat, and of the impulie of the blood 

 at the commencement of the hot fit, a great in- 

 creafe of itimulus is induced, and is now added to 

 the increafed irritability of the fyflem, which was 

 occafioned by its previous quiefcence. This addi- 

 tional flimulus of heat and momentum of the blood' 

 augments the violence of the movements of the ar- 

 terial and glandular fyftem in an increafing ratio. 

 Thefe violent exertions flili producing more heat and 

 greater momentum of the moving fluids, till at 

 length the fenforial power becomes walled by this 

 great ftimulus beneath its ufual quantity, and pre- 

 difpofes the fyflem to a fecond cold fit. 



At length all thefe unnatural exertions fpontane- 

 ouily fubfide with the increafed irritability that pro- 

 duced them ; and which was itfelf produced by the 

 preceding quiefcence, in the fame manner as the 

 eye, on coming from darknefs into day-light, in a" 

 little time ceafes to be dazzled and pained, and 



gradually 



