"I have... been obliged to make my experiments upon the second [method]. ...I at first employed the bitter saline liquor called bittern, which remains in the pans after the evaporation of sea-water. But as that liquor is not always easily procured, I afterwards made use of a salt called Epsom salt, which is separated from the bittern by crystallization, and is evidently composed of magnesia and the vitriolic acid."
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Experiments upon Magnesia Alba, Quick-Lime, and other Alcaline Substances
Experiments upon Magnesia Alba, Quick-Lime, and other Alcaline Substances by Joseph Black was first published in 1755. Black's Paper was read in June 1755, and was first published in "Essays and Observations, Physical and Literary. Read before a Society in Edinburgh, and Published by them," Volume II., Edinburgh, 1756; pp. 157-225. It was subsequently reprinted several times during the life of the author, not only in later editions of these Essays, but also in a separate form.
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