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evaporated to the consistence of aloes, by placing it in an earthenor tin vessel, broadest at top, which is set in another vessel half fullof water kept boiling. When the boiling has been continued suffi-ciently long, it is to be poured out, while hot, on a smooth stone, oroiled board. Of this purified aloes, a similar dose will be sufficient,and it will act with greater certainty and less violence.

Rose water, violet water, borage and bugloss water, were formerly usedin the process of purifying aloes, and the products were thence called,Aloe rosata, Aloe violata, and Aloe insuccata.

Incompatible with galls, oak bark, and astringent bitters, which destroyits purgative qualities. (Braconnot.)

Soluble in water and weak acids, but more perfectly in alcohol.

Medicinally it is a bitter stimulating cathartic, acting on the colon andrectum, in doses of gr. v to 9j, twice a day, in constipation, hysteria,worms, amenorrhoea, &c, but is accused of causing piles, &c Bycombining it with alkaline salts and soap its operation is renderedmilder. It is alterative and stomachic, in doses of gr. ij to gr. iijwith assafcetida, in dyspepsia, hysteria, &c. As a clyster for worms,5j may be boiled in milk.

Improper when there is any tendency to abortion.

Enters into Decoct. Aloes Compos. L. Ext. Colocyth. Comp. L. D.Ext. Aloes. L. D. Tinct. Aloes. L. E. D. Tinct. Aloes iEtherea.E. Tinct. Aloes Comp. L. E. D. Tinct. Benzoini Comp. L. E. D.Vin. Aloes. L. E. D. Tinct. Rhei et Aloes. E. Pulv. Aloes Comp. L.Pil. Cambog. Comp. L. Pil. Aloes cum Myrrha. L. E. D. Pil.Aloes et Assafcetidse. E.—Cum Colocynthide. E.—Rhei Comp. E.Pil. Scammoneae Comp. cum Aloe. D. Pil. Aloes. E. D.Aloes Cabalina. Horse Aloes. This is an impure sort of aloes, pro-cured from a decoction of the leaves, and is of a rank foetid odour.It is chiefly used as a cheap purgative by farriers, or to adulterate thesocotrine aloes. The dose for a horse is Jss to |j.Aloetic Acid. A name given by M. Liebeg to the bitter principle ofaloes, procured by means of nitric acid sp. gr. 1-25. It precipitatesthe salts of baryta, lead, and peroxide of iron, of a deep purplecolour; and forms a purple salt with potass.Alterative Medicines are those which act mildly, and produce agradual change in the system; such as sarsaparilla, guiacum, andchamomile, and small doses of the preparations of mercury and anti-mony, or of sulphur, sulphuric acid, rhubarb, &c.Alth^eje Folia et Radix. L. E. D. P. Marsh Mallow Leaves andRoot. Althcea officinalis. The plant contains asparagine. Demulcent,emollient, and lubricating, in cough, hoarseness, stone, stranguary,ardor urinse, &c.; given in infusion or decoction, ad libitum. As a

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