222 OF THE STOMACH SECT. XXV. 15, 



ture ? All thefe fads may be eafily obferved by any one, who 

 takes a brifk purge. 



1 5 Where the (limulus on the ftomach, or on fome other 

 part of the inteftinal canal, is dill more permanent, not only the 

 lacteal veiTels, but the whole canal itfelf, becomes inverted from 

 its aiTociations ; this is the iliac pafTion, in which all the fluids 

 mentioned above are thrown up by the mouth. At this time 

 the valve in the colon, from the inverted motions of that bowel, 

 and the inverted adtion of this living valve, does not prevent the 

 regurgitation of its contents. 



The (trudture of this valve may be reprefented by a flexile 

 leathern pipe itanding up from the bottom of a veflel of water : 

 its fides coliapfe by the preiTure of the ambient fluid, as a fmall 

 part of that fluid paffes through it; but if it has a living power, 

 and by its inverted action keeps itfelf open, it becomes like a 

 rigid pipe, and will admit the whole liquid to pafs. See Set. 

 XXXIX. 2. 5. 



In this cafe the patient is averfe to drink, from the conflant 

 inverfion of the motions of the llomach, and yet many quarts 

 are daily eje&ed from the ftomach, which at length fmell of ex- 

 crement, and at lad feem to be only a thin mucilaginous or aque- 

 ous liquor. 



From whence is it pofSble, that this great quantity of fluid for 

 many fueceflive days can be fupplied, after the cells of the body 

 have given up their fluids, but from the atmofphere ? When 

 the cutaneous branch of abforbents acts with unnatural (Irength, 

 it is probable the inteltinal branch has its motions inverted, and 

 thus a fluid is fupplied without entering the arterial fyftem. 

 Could oiling or painting the fjcin give a check to this difeafe ? 



So when the ftomach has its morions inverted, the lymphatics 

 of the ftomach, which are molt ftridtly aflbciated with it, invert 

 their motions at the fame time. Bu; the mere diftant branches 

 of lymphatics, which are lefs ftriftiy aflbciared with it, act with 

 increased energy ; as the cutaneous lymphatics in the cholera, 

 or iliac paflion, above defcribed. And other irritative motions 

 become decreafed, as the pulfations of the arteries, from the ex- 

 traderivat'oii or exhauftion of the fenforial power. 



Sometimes when ftronger vomiting takes place the more dif- 

 tant branches of the lymphatic fyftem invert their motions with 

 thofe of the ftomach, and loofe ftpols are produced, and cold 

 fweats. 



So when the lafteals have their motions inverted, as during 

 the operation of ftrong purges, the urinary and cutaneous ab- 

 forbents have their motions increafed to iupply the want of flu- 

 icjin the blood, as in great thirft ; but after a meal with fuffi- 



cient 



