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The London Dispensatory, containing : 1. the Elements of Pharmacy ; 2. the botanical Description, natural History, chemical Analysis, and medicinal Properties of the Substances of the Materia Medica ; 3. the pharmaceutical Preparations and Compositions of the Pharmacopoeias of the London, Edinburgh, and Dublin Colleges of Physicians ; the Whole forming a Practical Synopsis of Materia Medica, Pharmacy, and Therepeutics
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PART III.

Decoctions.

615

parilla, the guaiacum, and the sassafras, in the water, with amoderate heat for six hours; then boil down to one half, add-ing towards the end of the coction the liquorice and the me-zereon; finally, strain."

This decoction is an imitation of the once celebrated LisbonDiet-drink. Its efficacy depends chiefly on the mezereon rootbark, the quantity of which, therefore, ordered by the DublinCollege is undoubtedly too small. It operates as a diaphoreticand alterative, and is found to be useful in the treatment of se-condary syphilis, chronic rheumatism, and in lepra, and someother cutaneous affections. The dose is from fjiv. to fjvj. takenthree or four times a day.

DECOCTUM SENEGJE. Lond. Decoctum polygaijeSenega. Edin. Decoction of Seneka. 1

" Take of seneka root, an ounce ; water, two pints. Boildown to a pint, and strain."

This decoction is of a brownish olive colour, inodorous, andhas a hot pungent taste. Its virtues have been already dis-cussed under the account of the root. (Part ii.) The dose isfrom fjjfs. to f^iij. taken three or four times a day.

DECOCTUM ULMI. Lond. Dub. Decoctum UlmiCa.mpestris. Edin. Decoction of Elm Bark.

" Take of fresh elm bark bruised, four ounces; water, fourpints,(fve pints, Edin.) Boil to two pints, and strain."

This decoction is thick, slightly mucilaginous, and of a browncolour; has a faint odour and a bitterish taste. Alcohol addedto it produces a precipitate of light brown flakes; tinctures,therefore, in any considerable quantity, are inadmissible in for-mula; with it. Its medicinal properties have been already no-ticed. (Sec Ulnms, Part ii.) The dose is from fjiv. to fjvj.taken twice or Ihrce times a day.

DECOCTUM VERATRI. Lond. Decoction of WhiteHellebore.

" Take of white hellebore root bruised, an ounce ; water, twopints; rectified spirit, two fluid ounces. Boil the hellebore rootwith the water down to a pint, and strain; then, when the de-coction is cold, add the spirit."

This decoction is stimulant, acrid, and cathartic; but itsoperation is too violent for internal use. As a lotion it oftenproves beneficial in scabies, tinea capitis, and other cutaneouseruptions ; but it requires to be used with caution even as anexternal remedy.

1 Decoction de Polygale Senege (F.) Senegawurzel-dekokte (G.) Decotto di PoligalaSenega (/.)

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