Omitted from the Materia Medica chapter are: Medicaments that have become obsolete, or that are too rarely used to be of general interest; and such new remedies as are not yet safely accredited on reliable authority; also those galenic preparations (syrups, extracts, pills, essences, elixirs, wines, emulsions, etc.) which are not standardized according to the U.S. Pharmacopœia; likewise all articles that are put up and advertised for self-medication by the lay public.
— from Merck's 1899 Manual of the Materia Medica by Merck & Co.
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