SECT. XXXII. 9. 2. OF IRRITATION. 299 



is greater, from the increafed heat of the fldn. But at the de- 

 cline of the hot fit, as the mouths of the abforbents of the fkin 

 are expofed to the cooler air, or bed-clothes, thefe veffels fooner 

 lofe their increafed activity, and ceafe to abforb more than their 

 natural quantity : but the fecerning vefTels for fome time longer, 

 being kept warm by the circulating blood, continue to pour out 

 an increafed quantity of perfpirable matter, which no\v Hands 

 on the (kin in large vifible drops *, the exhalation of it alfo being 

 leflcned by the greater coolnefs of the fkin, as well as its abibrp- 

 tion by the diminifhed action of the lymphatics. See Clafs I. 

 I. 2. 3. 



The increafed fecretion of bile and of other fluids poured in- 

 to the inteftines frequently induces a purging at the decline of 

 the hot fit ; for as the external abforbent veflels have their 

 mouths expofed to the cold air, as above mentioned, they ceafe 

 to be excited into unnatural activity fooner than the fecretory 

 veflels, whofe mouths are expofed to the warmth of the blood : 

 now, as the internal abforbents fympathize with the external 

 ones, thefe alfo,, which during the hot fit drank up the thinner 

 part of the bile, or of other fecreted fluids, lofe their increafed 

 activity before the gland lofes its increafed activity, at the de- 

 cline of the hot fit ; and the loofe dejections are produced from 

 the fame caufe that the increafed perlpiration {lands on the fur- 

 face of the fkin, from the increafed abibrption ceafmg fooner 

 than the increafed fecretion. 



The urine during the cold fit is in fmall quantity and pale, 

 both from a deficiency of the fecretion and a deficiency of the 

 abforption. During the hot fit it is in its ufual quantity, but 

 very high coloured and turbid, becaufe a greater quantity had 

 been fecreted by the increafed action of the kidneys, and alfo a 

 greater quantity of its more aqueous part had been abforbed from 

 it in the bladder by the increafed adtion of the abforbents ; and 

 laltly, at the decline of the hot fit it is in large quantity and lefs 

 coloured, or turbid, becaufe the abforbent veflels of the bladder, 

 as obferved above, lofe their increafed action by fympathy with 

 the cutaneous ones fooner than the fecretory veflels of the kid- 

 neys iofe their increafed activity. Hence the quantity of the fed- 

 iinent, and the colour of the urine, in fevers, depend much on the 

 quantity fecreted by the kidneys, and the quantity abforbed from 

 it again in the bladder : the kinds of fediment, as the lateritious, 

 purulent, mucous, or bloody fediments, depend on other caufes. 

 It ihould be obferved, that if the fweating be increafed by the 

 heat of the room, or of the bed-clothes, a paucity of turbid urine 

 will continue to be produced, as the abforbents of the bladder 

 will have their activity increafed by their fympathy with the 



veflels 



