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As nearly as can be ascertained, M'Munn's Elixir is simply an aqueous infusion of opium procured by the ordinary maceration and preserved from decomposing by the subsequent addition of a small portion of alcohol. Narcotin being absolutely insoluble in water is eliminated as the circular says. This fact alone would not account for the difference between its action and that of laudanum.
The remainder, five in number, are the opium alkaloids, which act generally upon the whole system, but particularly, in their immediate phenomena, upon the brain. I mention them in the ascending order of their nervine power; narcotin; codein; opianin; metamorphia, and morphia.
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