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Drinking Impure water.

--The following deserves the consideration of the reader:

‘ Set a pitcher of water in a room inhabited, and in few hours it will have absorbed from the room nearly all the respired and perspired gasses of the room, the air of which will have become purer, but the water nearly filthy.--This depends on the fact that the water has the faculty of condensing, and thereby aborting all the gases, which it does without increasing its own balk. The colder the water is the greater its capacity to contain these gases. At ordinary temperatures, a pint of water will contain a pint of carbonic gas and several pints of ammonia.

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