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Several months ago, I took 24 ounces of mixt metal, and pur the same intoaqua fortis , and set it on warm sand, and there being a fault in the glass, it crackt; by which some of theaqua fortis , which was impregnated with silver, run into the sand, and I don’t know but I might have lost gold also in the same.

Il. Observations on staining the fingers with a solution of silver, in aqua fortis, &c. In a letter from Mr. Anthony Van Leuwenhoek, F. R. S