Medical transactions / Royal College of Physicians of London.

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Credit: Medical transactions / Royal College of Physicians of London. Source: Wellcome Collection.

    61/62 page 53
    I beg leave to add that this fixed or fixable air (if a weak acid) is the moft univerfal acid in nature, as not only all limeftone, chalk, marble, and marles are replete with it j but it makea up a great part of the compofition of all animal and vegetable bodies, and floats in great abundance in the at- mofphere: as appears from the ex¬ periments of procuring fixable air from all thefe bodies, by fermentation, or by the addition of ftronger acids, by burning charcoal, and laftly from the fcum which is almoft inftantly pro¬ duced on lime water expofed to the air, which is a re-produdtion of limeftone. I am, Gentlemen, with great refpedt, « « Your very humble fervant, JOHN POWER.
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