. A civic biology : presented in problems. Biology; Sanitation. Filter beds at Albany, N. Y. sewage from cities above them on the river has flowed. Filter- ing such water by means of passing the water through settling basins and sand filters removes about 98 per cent of the germs. The result of drinking unfiltered and filtered water in certain large cities is shown graph- ically at right. In cities which drain their sewage into rivers and lakes, the question of sewage disposal is a large one, and many cities now have means of dis- posing of their sew- B 60 100 120 140 160 160 ZOO 220. age in s
. A civic biology : presented in problems. Biology; Sanitation. Filter beds at Albany, N. Y. sewage from cities above them on the river has flowed. Filter- ing such water by means of passing the water through settling basins and sand filters removes about 98 per cent of the germs. The result of drinking unfiltered and filtered water in certain large cities is shown graph- ically at right. In cities which drain their sewage into rivers and lakes, the question of sewage disposal is a large one, and many cities now have means of dis- posing of their sew- B 60 100 120 140 160 160 ZOO 220. age in some man- Cases of typhoid per 100,000 inhabitants before filtering water supply (solid) and after (shaded) in A, AVater- town, N. Y.; B, Albany, N. Y.; , Mass.: D, Cincinnati, Ohio. What is the effect of filtering the water supply ? ner as to render it harmless to their neighbors. Railroads are often responsible for carrying typhoid and spread- ing it. It is said that a recent outbreak of typhoid in Scranton, Pa., was due to the fact that the excreta from a typhoid patient traveling in a sleeping car was washed by rain into a reservoir near which the train was passing. Railroads are thus seen to be great open sewers. A sanitary car toilet is the only remedy. HUNTER, CIV. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hunter, George W. (George William), 1873-1948. New York : American Book Company
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