. Bacteria, especially as they are related to the economy of nature. Bacteriology. 6o BACTERIA mind a point that is systematically neglected, namely, that the bacterio^'^|T^''^^1 ^xnoiin^t'^n of a water which is suspected of having conveyed the disease is from a variety of circum- stances co,nducted too late to detect the causal bacteria. The incubation period of typhoid we may take at fourteen days. Let us suppose a town water supply is polluted with some typhoid excreta on the 1st of January. Until the 14th of January there may be no knowledge whatever of the state of affairs. Two or three d
. Bacteria, especially as they are related to the economy of nature. Bacteriology. 6o BACTERIA mind a point that is systematically neglected, namely, that the bacterio^'^|T^''^^1 ^xnoiin^t'^n of a water which is suspected of having conveyed the disease is from a variety of circum- stances co,nducted too late to detect the causal bacteria. The incubation period of typhoid we may take at fourteen days. Let us suppose a town water supply is polluted with some typhoid excreta on the 1st of January. Until the 14th of January there may be no knowledge whatever of the state of affairs. Two or three days are required for notification of cases. Several more days elapse generally before bacterio- logical evidence is demanded. Hence arises the anomalous. B. COLI COMMUxMS position of the bacteriologist who sets to work to examine a water suspected of typhoid pollution three weeks previously. There can be no doubt that these difificulties are very real ones. The tQ_J:h_r pr'^Hjein will be found in Dr. Klein's dictum that " a water in which sewage organisms have been detected in large numbers should be regarded with suspicion " ' as the vehicle of typhoid, even though no typhoid bacilli were discoverable. The chief of these sewage bacteria are believed to be Proteus vulgaris, B. colt, P. zenkeri, and B. enteritidis, and they are all nearly related to B. typhosus. The presence of the B. coli in limited numbers is not suffi- ' Harben Lectures, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Newman, George, Sir, 1870- [from old catalog]. New York, G. P. Putnam's sons;
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