Sources of Water Supply.
(Continued from page 65.)
That running water will to some extent purify itself there can be no doubt, but the extent to which this purification will take place is much less than is commonly supposed. Undoubtedly many streams seem to be more pure as the distance from the source of pollution increases. The cause of this is oxidation, deposition and dilution, besides consumption of a certain amount by fishes, microscopic animal and vegetable life.
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