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The first edition of this book was published in 1904 and is well known to water analysts. Apart from the introduction of new details and illustrations and some important additions to the discussion of water standards, there are few noteworthy changes. So far as a bacterial standard is concerned the author seems inclined to adopt Houston's well-known views, according to which a water is to be regarded as safe when it never contains Bacillus coli in 100 c.c. samples; reasonably safe when it contains B. coli in less than half the number of 100 c.c. samples examined; suspicious (in Houston's words "to be viewed with some degree of preliminary disfavor") when it contains B. coli in a majority of 100 c.c. samples. These standards call for a higher degree of purity than that possessed by those public water-supplies in this country which are usually regarded as of excellent quality.
The Examination of Waters and Water-Supplies. JAMA. 1913;61(21):1925. doi:10.1001/jama.1913.04350220069034
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