matter decays on the banks and is washed into the ing 98 million gallons and 53 million gallons respec- now in course of construction at Washington, D. C, stream by occasional showers, or blown upon its sur- the second largest in the world, is a good illustration. tively. Thence the water passes… … Partlj' Completed Filter. Construction Work of Filtration Plant. A MODERN FILTRATION PLANT. face by the wind, the clear water may be and often is The water is drawn from the Potomac River above city tunnel, commonly known as the Lydecker tunnel, much more fully charged with dangerous microscopic…
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