Sup. I. 12. 7. THEORY OF FEVER. 483 



chillnefs of fome people after dinner ; and contrariwife by the 

 digeftion being ftrengthened, when the fkin is expofed to cold 

 air for a (hort time ; as mentioned in Clafs IV. 1. 1.4. and IV. 

 2. 1. 1. and from the heat and glow on the fkin, which attends 

 the action of vomiting ; for though when ficknefs firft com- 

 mences, the fkin is pale and cold ; as it then partakes of the gen- 

 eral torpor, which induces the ficknefs ; yet after the vomiting 

 has continued fome minutes, fo that an accumulation of fenlb- 

 rial power exifls in the capillaries of the ftomach, and of the 

 fkin, owing to their diminifhed action ; a glow of the ikin fuc- 

 ceeds, with fweat, as well as with increafed abforption. 



7. Neverthelefs in fome circumftances the ftomach and the 

 heart and arteries feem to act by direct fympathy with the cu- 

 taneous capillaries, as in the fluihing of the face and glow of the 

 fkin of fome people after dinner ; and as in fevers with ftrong 

 pulfe. In thefe cafes there appears to be an increafed produc- 

 tion of fenforial power, either of fenfation, as in the blufh of 

 fhame •, or of volition, as in the blufh of anger ; or of irritation, 

 as in the flu (bed face after dinner above mentioned. 



This increafed action of the capillaries of the fkin along with 

 the increafed actions of the ftomach and heart is perhaps to be ef- 

 teemed a fynchronous incrafe of action, rather than a fympathy 

 between thole organs. Thus the flufhing of the face after din- 

 ner may be owing to the fecretion of fenforial power in the brain 

 being increafed by the ailbciation of that organ with the ftom- 

 ach, in a greater proportion than the increafed expenditure of 

 it, or may be owing alfo to the ftiniulus of new chyle received 

 into the blood. 



8. When the ftomach and the heart and arteries are render- 

 ed torpid in fevers, not only the cutaneous, cellular, and pulmo- 

 nary abforbents are excited to act with greater energy; but alfo 

 their correfpondent capillaries and fecerning veflels or glands, 

 efpecially perhaps thofe of the fkin, are induced into more ener- 

 getic action. Whence greater heat, a greater fecretion of per- 

 fpirable matter, and of mucus ; and a greater abforption of them 

 both, and of aerial moifture. Thefe reverfe fympathies coin- 

 cide with other animal facts, as in eruption of fmall-pox on the 

 face and neck the feet become cold, while the face and neck are 

 much Sullied ; and in the hemiplegia, when one arm and leg be- 

 come difobedient to volition, the patient is perpetually moving 

 the other. Which are well accounted for by the accumulation 

 of fenforial power in one part of an aiTociated feries of actions, 

 when lefs of it is expended by another part of it; and by a defi- 

 ciency of fenforial power in the fecond link of affociation, when 

 too much of it is expended by the hrft. 



y. This 



