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By E. W. Caryl Thomas (Auth.)

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T h e limit in parts per 100,000 a n of free ammonia is 0-002, of albuminoid ammonia 0-005, ^ oxygen absorbed o-i. There should be no nitrates or nitrites. ENVIRONMENTAL HYGIENE S3 A chemical analysis is of strictly limited value. T h e exact amount or specific nature of pollution is not determinable by chemical analysis ; nor is the test sufficiently sensitive to lead to the detection of pollution by ο·ι per cent sewage or by ι per cent of most effluents. In bacteriological examination, the full examination consists of the quantitative estimation of the number of organisms growing on media, the isolation and detection of indicator organisms such as B.

Local authorities paid hospitals for the work they did for them, and many authorities took advantage of their powers to make direct grants from the rates. T h e most successful of the ways of raising money, however, was the creation of hospital contributory schemes. T h e Hospital Saturday Fund had been founded before 1914. Others developed after 1918, mostly between the years 1929 and 1934. Most of the schemes restricted their membership to those of the lower income limits. For their contributions subscribers received free treatment in the voluntary hospitals.

At the same time as the medical man was in these ways being brought closer to the work of central and local government departments, local authorities were gradually extending their activities in the field of clinical medicine, more especially for certain sections of the population and for those suffering from certain diseases or abnormal states. T h e school health service had expanded until, by the Education A c t of 1944, education authorities were obliged to provide free of cost to all children attending maintained schools any medical treatment they required, excepting a domiciliary service.

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