Chap. XXXV. Of Extracts and Resins.

591

VlNUM VERATRI. Lond.

Wine of White Hellebore.Take of

White hellebore root sliced, eight ounces ;Wine, two pints and a half.Macerate for fourteen days, and filter.

This preparation is now introduced, we are told by DrPowell, " because it is a medicine usefully and extensively em-" ployed in practice." This must be understood as applyingonly to London, for it is not yet known in Edinburgh, al-though there can be no doubt of its activity.

Chap. XXXV.—EXTRACTS and RESINS.

Extract, in pharmacy, has long been used, in the common and true acceptation of the term, to express a thin-, ex-tracted, and therefore A was applied to substances of a'l kindswtneb were extracted from heterogeneous bodies, by the 2turn of any menstruum, and again reduced to a consist^form by the evaporation of that menstruum. Lately Wever Extract has been used in a different and much moreTmited sense as the name for a peculiar principle, which is ofteaindeed contained n extracts, and which before had no proberappellation. It .s m the former sense that we employ ifhTreand m which we wish it to be only used, while a /ew wordshould be mvented as the name of the new substance Tilla better be proposed, we shall call it Extractive.

I he London college have also added to the confusion intheir las edition by applying the term extract to w at \re

C :^l Called ,nSPiSSatCd jUiC£S ' Wh — -enstTuuI/i:Extracts are of varions kinds, according in f) 10 *, • r

the substances from which they are obtain!d a nd thfTstruurn employed : but they commonly3 of u i J™"extractive, tannin, cinchonin, gallic acid or res -f' ^of them mixed in various proportion, Th ' '^^

commonly employed are wSS**^ t£%£Zcapable of extracting all the substances enumer Llthe resin, and the latter all except the *mT Wn^Tsometimes employed, but very imprope.K for a , , *°" can only act as a mixture of alcohol and w,,n, *'?'principles which it leaves beliind n" "' a " d tbe

injurious than ^^^ttZT^ ™ "*"