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II. OBSERVATIONS ON THE INVERTENTIA.
I. 1. The action of Vomiting seems originally to have been occafioned by disagreeable sensation from the distentiossor acrimony of the aliment; in the same manner as when any disgustsul material is taken into the mouth, as a bitter drug, and is rejected bythe retrograde motions of the tongue and lips; as explained in Class IV. ly. 1. 2, and mentioned in Sect. XXXV, I. 3. Or the disagreeable sensation may thus excite the power of volition, which may also contribute to the retrograde actions of the stomach and oesophagus, as when cows bring up the contents of their first stomach to remasticate it. To either of these is to be attributed the action of mild emeties, which soon cease to operate, and leave the stomach stronger, or more irritable, after their operation; owing to the accumulation of the
A sensorial power of irritation during its torpid or
mit, or purge. And lastly, the fickness and VOmiting induced by large potations of wine, or opium, does not occur till next day in some people, in none till.some time after their ingurgitation. And tincture of digitalis in the dose of 30 or 60 drops, though applied in solution, is a considerable time before it produces its effect; though Vomiting is instantaneoufly induced by a nauseous idea, or a nauseous taste in the mouth. At the same time there seem to be some materials, which can immediately stimulate the stomach into such powerful action, as to be immediately succeeded by paralyfis of it, and Consequent con
tinued fever, or immediate death ; and this with-
out exciting sensation, that is, without our perceiving it. Of these are the contagious matter of some fevers swallowed with the saliva, and probably a few grains of arsenic taken in solution. See Suppl. I. 8. 8. Art. IV. 2. 6. 9.
3. Some branches of the lymphatic syfiem become inverted by their sympathy with other branches, which are only stimulated into too vio'lent absorption. Thus, when the stomach and duodenum are much siimulated by alcohol, by nitre, or by worms, in some persons the urinary lymphatics have their motion inverted, and pour that material into the bladder, which is absorbed from the intestines. Hence the drunken diabetes