Experiments on a new earth : found near Stronthian in Scotland / [Richard Kirwan].

  • Richard Kirwan
Date:
1794
Catalogue details

Licence: Public Domain Mark

Credit: Experiments on a new earth : found near Stronthian in Scotland / [Richard Kirwan]. Source: Wellcome Collection.

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    ■6°* The folution of marine felenite being flightly boiled, lime-water was added to it ; a cloud fbill appeared, but the pre¬ cipitate was much lefs copious than when the unboiled folution was ufed. 7°* To a folution in the nitrous acid, not of marble, but of lime formed of marble, lime-water was added; no precipitate or cloudinefs enfued. Hence it is clear that the precipitation, formed by the addition of lime-water to the acid folutions of Carrara marble, confided of the lime itfelf contained in the lime-water, and not of that united to the mineral acids, being occafioned by the fixed air abforbed by thofe acid folutions after or during its * extrication in the a£t of folution; for this precipitate mud be * either argill, magnefia or calcareous earth; if it were argill or magnefia the precipitate would be as copious from a boiled as from the unboiled folution, the contrary of which we have feen in the 6th experiment; it fhould alfo be found in the acid folutions of lime, which is contradicted by the 7th experiment ; if it were an earth feparated from an acid it drould be in the date of lime, and confequently foluble by an addition of more water, contrary to the 3d experiment; but if we fuppofe it a calcareous earth, precipitated from the lime-water by the fixed air contained in the acid folutions, all the phenomena exhibited by thefe experiments mud naturally occur. This air will pre¬ cipitate the lime in the lime-water added, as in the 2d expe- B 2 riment.
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