CLASS IV. 3. 2. 5. OF ASSOCIATION. 441 



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

 stomach sympathizes with it. See Enteritis, Class II. 1.2. 11. 

 Does this symptom of vomiting indicate, whether the disease be 

 above or below the valve of the colon? Does not the softer pulse 

 in some kinds of enteritis depend on the sympathy of the heart 

 and arteries with the sickness of the stomach? See Ileus and 

 Cholera. 



Hence this sickness, as well as the sickness in some fevers, 

 cannot be esteemed an effort of nature to dislodge any offensive 

 material; but, like the sea-sickness described above, and in Sect. 

 XX. 4. is the consequence of the associations of irritative or sen- 

 sitive motions. See Class I. 1.3. 9. 



5. Vomitio ab insultu paralytico. Paralytic affections generally 

 commence with vomiting; the same frequently happens from a 

 violent blow with a stick on the head; this curious connexion 

 of the brain and stomach has not been explained; as it resem- 

 bles the sickness in consequence of vertigo at sea, it would seem 

 to arise from a similar cause, viz. from disturbed irritative or 

 sensitive associations. 



6. Vomitio a titillatione faucium. If the throat be slightly 

 tickled with a feather, a nausea is produced, that is, an inverted 

 action of the mouths of the lymphatics of the fauces, and by 

 direct sympathy an inverted action of the stomach ensues. As 

 these parts have frequently been stimulated at the same time in- 

 to pleasurable action by the deglutition of our daily aliment, 

 their actions become strongly associated. And as all the food 

 we swallow is either moist originally, or mixed with our moist 

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

 which in some measure repels the moist saliva, is disagreeable to 

 the touch of the fauces; at the same time this nausea and vomit- 

 ing cannot be caused by disagreeable sensation simply, as then 

 they ought to have been increased exertions, and not decreased 

 ones, as shewn in Section XXXV. 1. 3. But the mouths of the 

 lymphatics of the fauces are stimulated by the dry feather into 

 too great action for a time, and become retrograde afterwards by 

 the debility consequent to too great previous stimulus. 



7. Vomitio cute sympathetica. Vomiting is successfully stopped 

 by the application of a blister on the back in some fevers, where 

 the extremities are cold and the skin pale. It was stopped by 

 Sydenham by producing a sweat on the skin by covering the 

 head with the bedclothes. See Class IV. 1. 1/3. and SuppJ. 

 I. 11.6. 



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