At the opening of the hygienic laboratory of the Michigan University in October, 1888, I began a new method for the bactériologic examination of drinking water, which, with various modifications, has been carried out since that time.
THE MICHIGAN METHOD.
The method may be briefly described as follows: The samples are collected in sterilized receptacles and sent to the laboratory without delay. Immediately on receipt, plates are made with 0.05 c.c.,0.1 c.c., 0.5 c.c., and 1 c.c. of the water. For many years only gelatin plates were prepared, and these were grown at room temperature. During the past two years, however, only agar plates are used, two sets being made, one of these grown at room temperature, and the other at 38 C. The reason for this modification will be understood by those engaged in the bactériologic study of drinking water. The toxicogenic bacteria of water have their
VAUGHAN VC. SOME TOXICOGENIC GERMS FOUND IN DRINKING WATER. JAMA. 1904;XLII(15):935–941. doi:10.1001/jama.1904.92490600001001
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