222 OF THE STOMACH Sect. XXV. ij, 



tare ? All tixefe fach may be eafily obferved by any one, who 

 takes a brifk purge. 



15. Where the ftimulus on the flomach, or on fome other 

 part of the intefilnal canal, is fliil more permanent, not only the 

 lacteal veffels, but the whole canal irfelf, becomes inverted from 

 its ailbciations : this is the iliac pafiion, 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 action of this living valve, does not prevent the 

 regurgitation of its contents. 



The flructure of this valve may be reprefented by a flexile 

 leathern pipe funding up from the bottom of a vefTei of water : 

 its fides collapfe by the preflure of the ambient fluid, as a fmali 

 part of that fluid paries through it j 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 Seel:. 

 XXXIX. 2. 5. 



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

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

 are daily ejected from the itomach, 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 poflible, that this great quantity of fluid for 

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

 have given up their fluids, but from the atmofphere r* When 

 the cutaneous branch of abforbents acts with unnatural ftrength, 

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



us a fluid is fupplied without entering the arterial fyftem. 

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



So when the flomach has its motions inverted, the lymphatics 

 of the flomach, which are moft ftrictly aflbciated with it, invert 

 their motions at the fame time. But the more diftant branches 



lymphatics, which are lefs ftri£ljy affociated with it, aft with 

 increafed energy •, as the cutaneous lymphatics in the cholera, or 

 iliac panion, above defcribed. And other irritative motions be- 

 come decreafed, as the pulfations of the arteries, from the extra- 

 derivation or exhauflion of the fenforial power. 



Sometimes when ftronger vomiting takes place the more dif- 

 - nt branches of the lymphatic fyftem invert their motions with 

 thofe of the flomach, and loofe ftools are produced, and cold 

 fweats. 



So when the lacteals have their motions inverted, as during 

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

 uts have their motions increafed to fupply the want of flu- 



. in the blood, as in great third ; but after a meal with fufS- 



cient 



