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Preparations and Compositions. Part III.

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which produce powerful effects in small doses are not exhibit-ed in this form, unless their bulk be increased by additionsof less efficacy ; those which require to be given in largerones are better fitted for other forms.

The most useful vehicle for taking the lighter powders, is anyagreeable thin liquid. The ponderous powders, particularlythose prepared from metallic substances, require a more con-sistent vehicle, as syrups; for from thin ones they soon sub-side, llesinous substances, likewise, are most commodiouslytaken in thick liquors j for in thin ones they are apt to runinto lumps, which are not easily diffused.

In pulverem triti. Dub.Powders.Substances to be powdered, previously dried, are to be pul-verized in an iron-mortar. The powder is then to be se-parated, by shaking it through an hair-sieve, and is to bekept in close vessels.

PuLVIS ALOES CUM CANELLA. Dub.

Powder of Aloes wit A Canella.Take of

Hepatic aloes, one pound ;

White canella, three ounces.Powder them separately, and then mix them.

This was formerly well known by the title of Hiera Picra.The spicv canella acts as a corrigent to the aloes, but thecompound is more adapted to the form of pills, than of pow-der.

PULVIS ALOES CUM GUAIACO. Dllb.

Powder of Aloes with Gaaiac.Take of

Hepatic aloes, one ounce and a half;

Gum guaiacum, one ounce ;

Aromatic powder, half an ounce.Hub the aloes and gum guaiacum separately to powder j then

mix them with the aromatic powder.

PULVIS ALOES COMPOSITUS. Lotld.

Compound Powder of Aloes.Take of

Socotorine aloes, one ounce and a half;

Gum-resin guaiac, one ounce ;

Compound powder of cinnamon, half an ounce.