The book Household Hygiene was written by author S Maria Sophronia Maria Elliott Here you can read free online of Household Hygiene book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Household Hygiene a good or bad book?
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Freshly decayed nitrogenous materials produce ammonia. After fur- ther bacterial and chemical action the ammonia is changed into nitrites and finally into nitrates. By testing for these products the amount of pollution, if any, and the time since it happened, may be usually determined. Another test is for common salt. Water polluted by house drainage contains, although a very small amount, yet more salt than ordinary water. In all cases the source of the water and the ordinary composition of un...polluted water in about the same locality, must be known. This, combined with the bacteriological tests, which should reveal the pres- ence and kind of germs, gives the trained analyst a good idea of the purity of the water. There are not many tests which are at all reliable in the hands of an amateur. The sense of taste and of smell are the chief tests which the housewife can apply for water. To find the odor of the water, a large bottle, two quarts or a gallon, may be two- thirds filled with the water, tightly corked and placed in a warm room.
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