[10]. Dole, R. B. The quality of the surface waters in the United States: U. S. Geol. Survey Water-Supply Paper 236, pp. 15–9, 1909.
[11]. Draper, H. N. Lacmoid and carminic acid as reagents for alkalies: Chem. News, Vol. 51, pp. 206–7, 1885.
[13]. Drown, T. M., and Martin, Henry. Determination of organic nitrogen in natural waters by the Kjeldahl method: Tech. Quart., Vol. 2, No. 3; Chem. News, Vol. 59, pp. 272–6, 1889.
[14]. Drown, T. M. The chemical examination of waters and the interpretation of analyses: Examinations by the State Board of Health of water supplies of Mass. 1887–90, pt. 1, Examination of water supplies, pp. 519–78, 1890.
[15]. ——. Report upon the examination of the outlets of sewers and the effect of sewage disposal in Massachusetts: Report Mass. State Board of Health, pp. 285–452, 1902.
[16]. ——, 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.
[17]. Dupre, Dr. Some observations on the permanganate test in water analysis: Analyst, Vol. 10, pp. 118–22, 1885.
[18]. 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.
[20]. ——, and Beneker, J. C. The estimation of carbonic acid in water: J. Am. Chem. Soc., Vol. 23, pp. 405–31, 1901.
[21]. Farnsteiner, Buttenburg, and Korn, Leitfaden für die chemische Untersuchung von Abwasser, Berlin, p. 20, 1902.