582. OF QUICK-LIME

be able to afcertain what proportion of any particular kind of lime is really reduced to a cauftic> ftate.This may be done as under:

Take a known quantity of the quick- lime, perfectly dry;—add to that its own weight, or more, of common crude fal-am- nioniac*, previoufly diffolved in a large proportion of water, and filtred 3—digeft this nearly in a boilit ng heat for fome hours, till no more fmell of volatile alkali is found to arife from it, adding frefh water as it evaporates. When the volatil fmell is no longer perceiv fe whole into a filtre,—let that pafs off,

add more hot water,—and more ftill, ti

oo e alkaline th

ow th

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it come through the filtre taftelefs and pure;—then dry the refduum, and weigh it;—the difference between that and the weight of the original lime, denotes the proportion of pure cauftic lime that was contained in the original mafs.

For, as the-muriatic acid attraGs cauftic calcareous earth more ftrongly than it does

c He sole ele ae at cle ae ee does the volatile alkali, the acid of the fal-

* Obferve, it is not volatile fal-ammoniac.

ammoniac,

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