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Rh One decillionth of a grain is the proper dose, and the effects last from seven to eight weeks.

It is not pretended that Hahnemann's Materia Medica consisted wholly of inert substances; far otherwise. Besides these, he also made use of many such articles as in common language are called poisons, such as arsenic, phosphorus, henbane, nox vomica, &c. Accordingly, arsenicum album, or white arsenic, has become one of the most common homoeopathic remedies;—its effects are supposed to last from thirty-six to forty days. It is directed to be used in the following cases. See Jahrs Manual, Vol. I, page 53.

"Allowing ourselves to be guided by the totality of the symptoms, the cases in which this medicine may be employed will appear to be:—Affections, especially of exhausted persons, of nervous, or of leucophlegmatic constitution, with tendency to catarrhs and to blenorrhœa, or to dropsical affections; or also affections of persons of lymphatic constitution, with tendency to eruptions, tetters, ulcerations, and suppurations; or persons of bilious constitution, of choleric or lively temperament, or with a tendency to