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Show How Streams Purify. I An Italian scientist has lately mndev 1 i detailed explanation of tho accoptod. fact that tho waters of lakes and rivers, riv-ers, howover thoroughly infected, poa- j loss tho power of purifying thorn- 'I selves. A great amount of bacteria,. this authority says. Is dragged to tho- ! bottom by tho precipitation of solid, tnnttcr, but this Is not tho only purifying puri-fying process. In swift currents tho-iroloclty tho-iroloclty of tho stronm Is In Itself a. sloanslng agent, and It has been shown, '.hat sunlight destroys bacteria in ' wator to a depth of three feet. Th Dbvlous conclusion is that rapidly flow Ing streams or ponds not moro than. . throo feet deep contain tho purest 1) water. |