"He is best remembered... for his work on magnesia alba which he presented for the doctor's degree in 1754. In this investigation he took up the study of what we now call as a new substance... we may sum up Black's results in a series of propositions: I. Magnesia alba when strongly heated loses about half its weight and yields a new substance magnesia usta () II. With vitriolic acid magnesia alba yields epsom salt () with effervescence. III. Magnesia usta when similarly treated yields epsom salt without effervescence. IV. In a solution of epsom salt, mild alkali () precipitates magnesia alba and the solution on evaporation yields vitriolated tartar (). V. Mild alkali effervesces with acids while caustic does not. VI. Mild alkali is made caustic by addition of magnesia usta."
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A History of Chemistry (Moore)
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