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The Effect of Freezing upon Impurities Contained in Water?
—The Massachusetts State Board of Health, (June, 1890,) publish experiments with seventy-six samples of water, and 336 samples of ice from fifty-eight localities, to answer the above question.In ice from polluted sources compared with water from the same, the experiments showed: 1. That in the ice the color and salt had been removed. 2. That all but 13 per cent, of the other impurities of the water, as shown by chemical analysis, had been removed. 3, The number of bacteria in the cubic centimetre were: For snow (one sample) 1,246; for clear ice (part of the same cake as above,) 6; for clear ice from an unpolluted source, o. 4. The average of 12 samples from most polluted sources, 138. The number of bacteria varied much in different parts of the same cake.From the examinations which have been made,
MEDICAL PROGRESS. JAMA. 1890;XV(8):286–288. doi:10.1001/jama.1890.02410340018002
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