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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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726

Ointments.

fa/it III.

" Take of purified mercury, two founds; prepared lard,twenty-three ounces; prepared suet, an ounce. First rub themercury with the suet and a little of the lard, until the globulesdisappear; then add the remainder of the fat, and mix."

Two drachms of this ointment contain one drachm ofmercury.

Unguentum Hydrargyri. Edin. Mercurial Ointment.

" Take of mercury, mutton suet, of each one part; hog'sJard, three parts. Rub the mercury diligently in a mortar witha little of the hog's lard until the globules disappear; then addthe remainder of the lard."

One drachm of this ointment contains twelve grains ofmercury.

" It may also be made with double or triple the quantity ofmercury."

Dublin.

" Take of purified mercury, prepared hog's lard, equalweights. Rub them together in a marble or an iron mortal'until the obuies disappear."

One di achni of this ointment contains thirty grains of mer-cury.

UNGUENTUM HYDRAR'GYRI MIT'IUS. 1 Lond.Dub. Milder Mercurial Ointment.

" Take of the stronger mercurial ointment, a pound; pre-pared lard, two pounds. Mix them."

One drachm of this ointment contains ten grains of mer-cury ; but prepared according to the Dublin Pharmacopoeia,with two parts of lard to one of mercury, one drachm containsa scruple of mercury.

The preparation of the stronger mercurial ointments requiresmuch labour, care, and patience. During the trituration themercury is mechanically divided into minute globules, whichare prevented from running together again by the viscosity ofthe suet; and during the trituration they are afterwards gradu-ally oxidized by attracting the oxygen of the atmosphere; thelard, the extension and the constant renewal of the surface ex-posed, favouring very much this effect. The fact of the oxi-dizement of the metal in this process is now generally admitted;and whatever tends to favour it, as, for instance, a slight degreeof rancidity of the lard, or the oil of eggs, shortens the time,and lessens the labour required for the preparation of theointment. It is not uncommon, however, to use other means,which are not admissible, to facilitate the process, such as theuse of sulphur or turpentine. The first may be detected by

' Unguentum cseruleum minus, P. L. 1745.

 
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