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——, and HAZEN, ALLEN. A report of the chemical work done at the Lawrence Experiment Station: Examinations by the State Board of Health of water supplies of Mass. 1887–90, pt. 2, Purification of sewage and water, pp. 707–34, 1890.

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DUPRE, Dr. Some observations on the permanganate test in water analysis: Analyst, Vol. 10, pp. 118–22, 1885.

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ELLMS, J. W. A study of the relative value of lacmoid, phenacetolin, and erythrosine as indicators in the determination of the alkalinity of water by Hehner’s method: J. Am. Chem. Soc., Vol. 21, pp. 359–69, 1899.

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——, and BENEKER, J. C. The estimation of carbonic acid in water: J. Am. Chem. Soc., Vol. 23, pp. 405–31, 1901.

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FARNSTEINER, BUTTENBURG, and KORN, Leitfaden für die chemische Untersuchung von Abwasser, Berlin, p. 20, 1902.

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FORBES, F. B., and PRATT, G. H. The determination of carbonic acid in drinking water: J. Am. Chem. Soc., Vol. 25, pp. 742–56, 1903.

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