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August 30, 1902


JAMA. 1902;XXXIX(9):496. doi:10.1001/jama.1902.02480350034009

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The U. S. Geological Survey has for some years past been investigating the water supplies of the country in their economic bearings, and at the beginning of the present season it has taken up their consideration in a hygienic point of view. The investigation aims to discover the changing conditions as affected by pollution of various kinds, drainage and sewage, manufacturing, etc. The turbidity, color, odor, amount of nitrogen, as free ammonia, albuminoid ammonia, nitrites and nitrates, the amount of chlorin, the total residue, the alkalinity, hardness, amount of carbon dioxid and the proportion of bacterial contents are to be noted. Under special conditions the amount of iron will be determined and special study of microörganisms be made. The cooperation of a large number of observers in different localities is being secured and directions issued to insure uniform observations. The methods used for chemical and bacteriologic examinations are those recommended

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