Class IV. !. i. 2. OF ASSOCIATION. ffy 



is explained in Seel. XXXV. 1. In the beginning of intoxica- 

 tion the whole fkin becomes florid from the aflbciation of the ac- 

 tions of the cutaneous arteries with thofe of the ftomach, be- 

 caufe vinous fpirit excites the fibres of the ftomach into more 

 violent action than the ftimulus of common food ; and the cu- 

 taneous capillaries of the face, from their more frequent expo- 

 fure to the viciilitu-^es of cold and heat, poliefs more mobility or 

 irritability than thofe or other parts of the linn, as further ex- 

 plained in Sect. XXXIII. 2. 10. Vinegar is liable to produce 

 this flufhing of the face, which probably is owing to the quanti- 

 ty of vinous fpirit it contains, as I believe the unfermented veget- 

 able acids do not produce this effect:. In every kind of blufh 

 the arterial blood is propelled into the capillaries farter than the 

 venous abforption can carry it forwards into the veins, in this 

 refpect refembling the tenfio phalli. 



Can the beginning vinous or acetous fermentation of the ali- 

 ment in weak ftomachs contribute to this effect ? or is it to be 

 afcribed to the greater power of afibciation between the arteries 

 of the face and the fibres of the ftomach in fome people than in 

 others ? 



M. M. Eat and drink lefs at a time, and more frequently. 

 Put 20 drops of weak acid of vitriol into water to be drunk at 

 meals. Let the drefs over the ftomach and bowels be loofe. 

 Ufe no fermented liquors, or vinegar, or fpice. 



2. Sudorjlragulis immerforum. Sweat from being covered in 

 bed. In the commencement of an epidemic fever, in which the 

 perpetual efforts to vomit was a diftrefling fymptom, Dr. Syd- 

 enham difcovered, that if the patient's head was for a fhort time 

 covered over with the bed-clothes, warmth was produced, and 

 a fweat broke out upon the fkin, and the tendency to vomit ceaf- 

 ed. In this curious fact two trains of afibciated motions are 

 excited into increafed action. Firft, the velTels of the lungs are 

 known to have their motion aflbciated with thofe of the fkin by 

 the difficulty of breathing on going into the cold bath, as defcrib* 

 ed in Sect. XXXII. 3. 2. Hence, when the ;°iTe!s of the 

 lungs become excited into ftronger action, by the bad air under 

 the bed-clothes, warmed and adulterated by frequent breathing, 

 thofe of the external (kin foon become excited by their aflbcia- 

 tion into more energecic action, and generate more heat along 

 with a greater fdcretion of perfpirable matter. Secondly, the 

 fympathy between the ftomach and (kin is evident in variety of 

 circumftances ; thus the cold air of frofty days applied to the 

 (kin for a fhort time increafes the action of the ftomach by re- 

 verfe fympathy, but decreafes it if continued too long by direct 

 fympathy *, fo in the circumiiance above mentioned, the action 



Vol, II. Z z of 



