BACTERIOLOGICAL TESTS AT NORFOLK.
DR. J. J. McCORMACK, was employed by the board of water commissioners of Norfolk, Va., to make a thirty-day guarantee test of the filter plant constructed there by the New York Filter company. The test was to determine (says Dr. McCormack’s report)
(1.) The reduction of color, which it was guaranteed would be ninety per cent; (2.) the reduction of albuminoid ammonia in suspension, which it was guaranteed, would be ninety per cent; (3.) the reduction of bacteria—the guarantee being that, if there were 7,000 bacteria in the raw water to the cubic centimetre, they would be reduced ninety-seven per cent. If there were less than 7,000 bacteria per cubic centimetre in^the raw water, there would be less than 100 per cent, to the cubic centimetre in the filtered water.
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