. On disorders of digestion, their consequences and treatment . the blood, theyare carried by it to the stomach as well as to the nerve centres,and thus they may irritate it and induce vomiting in exactly the ^ Buchheim, Arzncimittcllchrc, 1853-56, p. 304. N iva ANTI-EMETICS AND EMETICS. same way as if they had been passed into it through tlie emetic, for example, will cause vomiting, either when injectedinto the veins or when swallowed, but in both cases it reaches themucous membrane of the stomach and irritates it. It is true thatwhen injected into a vein it reaches the vom
. On disorders of digestion, their consequences and treatment . the blood, theyare carried by it to the stomach as well as to the nerve centres,and thus they may irritate it and induce vomiting in exactly the ^ Buchheim, Arzncimittcllchrc, 1853-56, p. 304. N iva ANTI-EMETICS AND EMETICS. same way as if they had been passed into it through tlie emetic, for example, will cause vomiting, either when injectedinto the veins or when swallowed, but in both cases it reaches themucous membrane of the stomach and irritates it. It is true thatwhen injected into a vein it reaches the vomiting centre also, butwhen swallowed it is sometimes rejected almost entirely, so thatlittle or none reaches the vomiting centre. In both cases, then, theemetic acts on the stomach, but only in one does it act on themedulla. Yet vomiting occurs in the one case as well as in theother, and it is therefore only natural to attribute it to the action Vessels of lung. Veins of general surfaceof body. Liver, Veins of stomach. Biliary circulation. Veins of Arteries going to nervecentres. Arteries to muscles. Arteries to stomach. .... Arteries to intestines. Kidney. Excretion by kidney. Fig. 21.—Diagram to show that emetics, &c., when absorbed by the superficial vein,will be carried both to the stomach and nerve centres. on the stomach, and not to its action on the medulla. Besides,tartar emetic only precipitates albumen when in presence of anacid; the gastric juice in the stomach therefore causes it to pre-cipitate the albumen in the mucous membrane. This producesirritation and inflammation in it, when no change whatever can bedetected, either by the naked eye or the microscope, in otherorgans, such as the medulla.^ It may thus be fairly said that,until we do find a change in the medulla, we ought to ascribe thevomiting only to the action of the emetic on the stomach. But having said thus much on the one side of the question, letus turn to the other, and see what argument
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