DISEASES OF IRRITATION. SEcr.^CXXII. 3. 



cold ; which coldnefs may often be felt by the hand 

 applied upon the affecled part. 



2. The importance of a greater or lefs deduction 

 of heat from the fyftem will be more eafy to compre- 

 hend,! if we fir ft 'coniider the great expenfe of fen- 

 forial power ufed in carrying on the vital motions ; 

 that is, which circulates, abforbs, fecretes, aerates, 

 and elaborates .the whole mafs of fluids with un- 

 ceafing afljduity. The fenforial power, or fpirit of 

 animation, ufed in giving perpetual and ftrong mo- 

 tion to the heart, which overcomes the elafticity and 

 vis inertise of the whole arterial fyftem ; next the 

 expenfe of fenforial power in moving with great 

 force and velocity the innumerable trunks and ra- 

 mifications of the arterial fyftem ; the expenfe of 

 fenforial power in circulating the whole mafs of 

 blood through the long and intricate intortions of 

 the very fine veflels, which compofe the glands and 

 capillaries; then the expenfe of fenforial power in 

 the exertions of the abforbent extremities of all 

 the lafteals, arid of all the lymphatics, which open 

 their mouths on the external furface of the fkin, 

 and on the internal furfaces of every cell or inter- 

 ftice of the body ; then the expenfe of fenforia,! 

 power in the venous abforption, by which the blood 

 is received from the papillary vefTels, or glands ? 

 where the arterial power ceafes, and is drank up, 

 and returned to the heart ; nexphe expenfe of fen- 

 forial power ufed by the mufclejj of refpiration in 

 their office of perpetually expanding the bronchia, or 

 air-vefleis, of the lungs ; and laftly in thevunceafing 

 periftaltic motions of the ilomach and whole fyftem 

 of inteitines, and in all the fecretions of bile, gaf- 

 tric juice, mucus, perfpirable matter, and the vari- 

 ous excretions from the lyliem. It" we coniider 

 the ceafeleis expenfe of fenforial power thus perpe- 

 tually employed, it will appear to be much greater 

 in a day than all the voluntary exertions of our 



mufcles. 



