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By Rai Bahadur Jaising P. Modi (Auth.)

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Extra info for Elements of Hygiene and Public Health. For the Use of Medical Students and Practitioners

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7) Sodium bisulphate in the proportion of 15 grains to one pint of water has been used by Rideal and Parkes. It kills disease germs, such as those of cholera, typhoid and dysentery in half an hour, but it imparts a somewhat acid taste to the water. (8) Potassium permanganate oxidizes all organic matter, and also serves as a deodorant. Hankin was the first to recommend its use for disinfecting cholerainfected wells. " It is now largely used for disinfecting wells. The disinfection is done by dissolving one ounce of potash permanganate in a dol full of water.

3. air, a known volume of the air should be aspirated through a dilute solution of caustic potash, when potassium chloride would be formed. The chlorine in the solution is then determined by means of a standard solution of silver nitrate. 54 HYGIENE AND PUBLIC HEALTH. 4. —This is absorbed as in the preceding, and titrated with a standard permanganate solution. 5. —This gas is absorbed by passing air through a lead acetate solution, and estimated as the black sulphide of lead. CHAPTER III. VENTILATION.

C. of water should be regarded as grossly contaminated with animal matter and very likely to contain infection. The Bacillus enteritidis indicates sewage pollution, and its presence in bacillary form or as spores is a certain sign of showing recent or remote contamination. Streptococci not being hardy show recent sewage contamination, but are not regarded by some to indicate dangerous contamination, unless accompanied by B. coli. —The presence of the colon bacillus is determined by planting small quantities of the water sample in lactose bile or lactose bouillon in fermentation tubes and incubating at 40° C.

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