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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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Infusions.

FART III.

Infcsum Quassia excels;e. Edin. Infusion of Quassia." Take of quassia wood, rasped, half a drachm. ; boilingwater, eight ounces. Macerate for two hours in a lightly co-vered vessel, and strain."

The active matter of quassia taken up by water appears tobe a pure, simple bitter. It is not altered by any of the sub-stances usually employed as adjuncts to bitters; and by twoonly of the metallic salts. Nitrate of silver slowly throwsdown soft yellow flakes; and superacetate of lead, a white pre-cipitate.

Medical properties and uses. — This infusion is a light tonic,very efficacious in dyspepsia, and other cases in which tonicsare indicated. In hysteria it may be combined with purgativesand tincture of valerian; in atonic gout, with aromatics ; andin dyspeptic affections with chalybeates, sulphate of zinc, ormineral acids. The dose is from fjj. to f^iij. given twice orthrice a day.

INFUSUM RHEI. Lond. Infusion of Rhubarb?" Take of rhubarb root, sliced, a drachm ; boiling water, half a.pint. Macerate for two hours in a lightly covered vessel, andstrain."

Edinburgh." Take of rhubarb root, bruised, half an ounce ; boilingwater, eight ounces; spirit of cinnamon, one ounce. Maceratethe root with the water in a covered vessel for twelve hours;then add the spirit, and strain."

These infusions differ chiefly in point of strength ; and theEdinburgh is rendered pleasanter by the spirituous addition.Neither of them is quite clear; and both have a reddish browncolour, which is very much deepened by the addition of alka-lies. The following substances either occasion precipitates inthese infusions, or otherwise alter their properties, and are there-fore incompatible in formulas with them : the strong acids, andlime-water, solutions of sulphate of iron, sulphate of zinc,nitrate of silver, oxymuriate of mercury, superacetate of lead,and tartarized antimony; infusions of catechu, cinchona andcusparia.

Medical properties and uses. — These infusions are the bestforms in which rhubarb can be given, when intended to acton the bowels. The dose of the former may be from f^j. tof 3 iv. and of the latter half the quantity, united with neu-tral salts or aromatics, as. circumstances may direct.INFUSUM ROSiE. Lond. Dub. Infusion of Roses. 1" Take of the dried petals of the red rose, half an ounce:

' Infusion <ie IUiuharbr (F.) RhaWber ini'usum (G.) Iufuso rfe Eabirbaro '/.)7 Infusion dt Rooes (F.J Rosen infusum. [G.) Iufusodi Rc?e (/.)

 
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