BIBLIOGRAPHY
[1] Wesbrook, Whittaker and Mohler. J. Amer. Pub. Health Assoc., 1911, 1, 123.
[2] Thomas. Jour. Ind. and Eng. Chem., 1914, 6, 548.
[3] Smeeton. Jour. of Bact., 1917, 2, 358.
[4] Clark and De Gage. Rpt. Mass. B. of H., 1910, p. 319.
[5] Thomas and Sandman. J. Ind. and Eng. Chem., 1914, 6, 638.
[6] Jordan, H. E. Eng. Record, 1915, May 17.