Part 27

——. Apparatus for the determination of ammonias in sand sewage: Am. Chem. J., Vol. 12, pp. 427–8, 1890.

Bibliography 42:

——. Report on the chemical precipitation of sewage: Examinations by the State Board of Health of water supplies of Mass., 1887–90, pt. 2, Purification of water and sewage, pp. 735–91, 1890.

Bibliography 43:

——. A new color standard for natural waters: Am. Chem. J., Vol. 14, pp. 300–10, 1892.

Bibliography 44:

——. Experiments on the purification of sewage at the Lawrence Experiment Station: Report Mass. State Board of Health, pp. 393–448, 1892.

Bibliography 45:

——, and CLARK, H. W. On the effect of temperature upon the determination of ammonia by Nesslerization: Am. Chem. J., Vol. 12, pp. 425–6, 1890.

Bibliography 46:

——, and ——. On the determination of nitrates in water: Chem. News, Vol. 64, pp. 162–4, 1891.

Bibliography 47:

HEHNER, OTTO. Estimation of hardness without soap solution: Analyst, Vol. 8, pp. 77–81, 1883.

Bibliography 48:

HILLEBRAND, W. F. The analysis of silicate and carbonate rocks: U. S. Geol. Survey Bull. 422, pp. 113–8, 127–8, 141–6, 219–20, 221, 222, and 230, 1910.

Bibliography 49:

HOLLIS, F. S. Methods for the determination of color and the relation of the color to the character of the water: J. N. E. Water Works Assoc., Vol. 13, pp. 94–118, 1898.

Bibliography 50:

HOWE, FREELAND, JR. A new method for determining the color of the turbidity of water: Eng. Rec., Vol. 50, pp. 720–1, 1904.

Bibliography 51:

ILOSVAY, L. L’acide azoteux dans la salive et dans l’air exhalé: Bull. de la Sociéte Chimique, ser. 3, Vol. 2, pp. 388–91, 1889.

Bibliography 52:

JACKSON, D. D. Permanent standards for use in the analysis of water: Tech. Quart., Vol. 13, pp. 314–26, 1900.

Bibliography 52a:

a. ——, and HORTON, W. A. Experiments on the putrescibility test for sewage and sewage effluents: J. Ind. Eng. Chem., Vol. 1, pp. 328–33, 1909.

Bibliography 53:

——, and ELLMS, J. W. On odors and tastes of surface waters, with special reference to anabaena, a microscopical organism found in certain water supplies of Massachusetts: Tech. Quart., Vol. 10, pp. 410–20, 1897.

Bibliography 54: