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18This seems to arise from an acrid and acid moisture being under the earth, from which the waters acquire their acridity; and when introduced into the system, dissolve that with which they come in contact whether generated by deposition or concretion. That acids will have this effect, is clear, from the experiment on an egg, whose shell, when kept therein for some time, will be softened and dissolve. Lead, also, which is very flexible and heavy, if placed in a vessel and covered with acid, and there left open, will be dissolved, and become white lead.
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