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Embrocatio Saponis cum Camphoka. Camphorated Embrocation ofSoap. Take Jij of liniment of soap, 3J of spirit of camphor, 513 ofoil of origanum, 3SS of tincture of opium. Mix, and apply in lum-bago, sciatica, and chronic rheumatic swellings.

Emery. A mineral of extreme hardness, found in Spain, the GrecianIslands, India, and in Jersey and Guernsey. It is much used forpolishing, for preparing razor-strops, &c. It is pounded in an ironmortar, and washed, and the powder separated into different degreesof fineness, according to the purpose it is intended for.Adulterated in the state of powder, with powdered flint, and othercheaper powders.

Emetia, or Emetin. New. P. A chemical principle found in ipe-cacuanha, &c. It is prepared by macerating 3j °f pulverisedipecacuan in Jij of ether for some hours with a gentle heat, in adistilling apparatus. Boil and triturate the portion that remainswith ^iv of alcohol in which it has been previously macerated, filterand treat it with alcohol again, till it cease to imbibe any thingfrom the powder. Mix all these, and evaporate to dryness, maceratethe extract in cold distilled water, filter again, and evaporate todryness. The emetia thus prepared is in scales of a reddish brown,is inodorous, acrid, somewhat bitter, but not nauseous, like ipecacuan.Incompatible with gallic acid, infusion of galls, acetate of lead, and

oxymuriate of mercury.Medicinally it may be given in doses of gr. \ to gr. iv as an emetic.

See Conspectus of Prescriptions.Another principle, which seems to be the basis of this, has been foundby treating ipecacuan with ether, alcohol, calcined magnesia, andliquor of ammonia. It is proposed to call it emeta, or pure emetin.Enters into Syrupus Emetinse. P.

Emplastra. Plasters, vulgarly called Plaistcrs, are medicinal applica-tions of a rather solid consistence, usually spread on linen, cotton,leather, paper, &c. M. Guersent divides plasters into emollient,astringent, exciting, irritating, and narcotic.— Did. de Medicine.

Emplastrum Adh^sivum. Adhesive Plaster. See Empl. Resina:.

Emplastrum Aluminosum. Alum Plaster. Take fcjss of dia-chylon plaster, 5VJ of prepared amber, 3J of burnt alum, Jss ofcamphor j mix and form a plaster. It is stimulating in cases ofrheumatism.

Emplastrum Ammoniaci. L. E. D. Ammoniacum Plaster. Take 5Vof purified ammoniacum, Oss of diluted acetic acid. Dissolve theammoniacum in the acid, evaporate in an iron vessel in a water-bath, carefully stirring it, till it is of a proper consistency. ^!r-Brande prefers a plaster made by softening ammoniacum with

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