The briskness of spring water is partly due to theeafl acid which it contains; though its usual coolness and abundance of atmospheric air dissolved in it are still mun portant. It is the absence of these qualities which re boiled or distilled water flat and insipid. Carbonic acfi originally termed fined air, from the circumstance of its hi been discovered by Dr. Black in 1757, as a solid or fixed stituent in limestone, and from its becoming fixed or oboe by solutions of the pure alkalies.

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