CLASS IV. 3.2.5. OF ASSOCIATION. 441 



-- 



the bowel, which is torpid during the intervals of pain j and the 

 ftomachfympathizes with it. See Enteritis, Clafs II. i. 2. u* 

 Does this fymptom of vomiting indicate, whether the difeafe be 

 above or below the valve of the colon ? Does not the fofter 

 pulfe in fome kinds of enteritis depend on the fympathy of the 

 heart and arteries with the ficknefs of the ftomach ? See Ileus 

 and Cholera. 



Hence this ficknefs, as well as the ficknefs in fome fevers^ 

 cannot be efteemed an effort of nature to diflodge any offenfive 

 material ; but like the fea-ficknefs defcribed above, and in Sect. 

 XX. 4. is the confequence of the affociations of irritative or fen- 

 fitive motions. See Clafs I.' i. 3. 9. 



5. Vomitio ab infultu paralytico. Paralytic affections generally 

 'commence with vomiting,- the fame frequently happens from a 

 violent blow with a flick on the head ; this curious connection 

 of the brain and ftomach has not been explained ; as it refem- 

 bles the ficknefs in confequence of vertigo at fea, it would feern. 

 to arife from a fimilar caufe, viz. from difturbed irritative or 

 fenfitive affociations. 



6. Vomitio a titillatlone faucium. If the throat be fiightly tick- 

 led with a feather, a naufea is produced, that is, an inverted ac- 

 tion of the mouths of the lymphatics of the fauces, and by di- 

 rect fympathy an inverted action of the ftomach eiifues. As 

 thefe parts have frequently been ftimulated at the fame time in- 

 to pleafurable action by the deglutition of our daily aliment, 

 their aclions become ftrongly affociated. And as all the food 

 we fwallow, is either moift originally or mixed with our moift 

 faliva in the mouth ; a feather, which is originally dry, and 

 which in fome meafure repels the moift faliva, is difagreeable to 

 die touch of the fauces ; at the fame time this naufea and vom- 

 iting cannot be caufed by difagreeable fenfation fimply, as then 

 they ought to have been increafed exertions, and not decreafed 

 ones, as (hewn in Section XXXV. 1.3. But the mouths of the 

 lymphatics of the fauces are ftimulated by the dry feather into 

 too great action for a time, and become retrograde afterwards 

 by the debility confequent to too great previous ftimulus. 



7. Vomitio cute fympaihetica. Vomiting is fuccefsfully flopped 

 by the application of a blifter on the back in fome fevers, where 

 the extremities are cold, and the fkin pale. It was flopped by 

 Sydenham by producing a fweat on the {kin by covering the 

 head with the bedclothes. See Clafs IV. i, i. 3. and SuppL 

 I. if. 6. 



VOL. II. 1 1 i ORDO 



