$4 DISEASES OF ASSOCIATION. SECT. XX&V. t. 



the adlion of the -fibres of die ftomach is increafed, 

 as by the fHmulus of a full meal, the exertions of 

 the cutaneous arteries of the face become in creafed 

 by their irritative afibciafions with thofe of the fto- 

 mach, and a glow or flaming of the face fucceeds. 

 For the fmall veflels of the fkin of the face having 

 been more accultomed to the varieties* of action, 

 from their frequent expofure to various degrees of 

 cold and heat become more eafily excited into in- 

 creafed a&ion, than thofe of the covered parts of 

 our bodies* aad thus aft with more energy from 

 their irritative or fentltive altbciations with the fto- 

 mach. On this account in fmall-pox the eruption 

 in confequence of the previous affection of the Ito- 

 mach breaks out a day fooner on the face than on 

 the hands, and two days fooner than on the trunk, 

 and recedes in fimilar times after maturation. 



But fecondly, in weaker confutations, that is, in 

 thofe who poffefs lefs fenforial power, fo much of 

 it is expended in the increafed a6lions of the fibres 

 of the ilomach excited by the ftimulus of a meal, 

 that a fenfe of chilnefs fucceeds inflead of the uni- 

 verfal glow above mentioned ; and thus the fecon- 

 dary part of the affociated train of motions is dimi- 

 nilhed in energy, in confequence of the increafed 

 activity of the primary part of it. 



2, Another inftance of a fimilar kind, where the 

 fecondary part of the train ads with lefs energy in 

 confequence of the greater exertions of the primary 

 part, is the vertigo attending intoxication ; in this 

 circumflance fo much fenforial power is expended 

 on the Romach, and on its neareft or more ihongly 

 affociated motions, as thofe of the fubcutaneous vef- 

 fels, and probably of ths membranes of fome inter- 

 nal vifcera, that the irritative motions of the retina 

 become imperfectly exerted from deficiency of fen- 

 forial power, as explained in Seel. XX. and XXI. 3. 

 pn Vertigo and on Drunkennefs, and hence the dag- 

 gering 



