. Bacteria, especially as they are related to the economy of nature. Bacteriology. BACTERIA IX WATER 49 properly filtered water. Hence the following has been recognised more or less as the standard : o- loo bacteria per cc. :=a good potable water. lOO- 500 " " := a suspicious water. 500-lCXX) or more " =a water which should have further filtration before being used for drinking purposes. The personal view of the writer after some of water examination would favour a standard of " under 5CX)" being a potable water, if the 500 were of a nature indicating neith
. Bacteria, especially as they are related to the economy of nature. Bacteriology. BACTERIA IX WATER 49 properly filtered water. Hence the following has been recognised more or less as the standard : o- loo bacteria per cc. :=a good potable water. lOO- 500 " " := a suspicious water. 500-lCXX) or more " =a water which should have further filtration before being used for drinking purposes. The personal view of the writer after some of water examination would favour a standard of " under 5CX)" being a potable water, if the 500 were of a nature indicating neither sewage pollution nor disease. Miquel holds that not more than ten different species of bacteria should be present in a drinking water, and such is a useful standard. The presence of rapidly liquefying bacteria associated with sewage or surface pollution would, even though present in fewer. Wolfhugel's Counter numbers than a standard, condemn a water. Thus it will be seen that it is impossible to judge alone by the numbers unless they are obviously enormously high. When we are counting colonies upon a Koch's plate, Wolfhugel's counter may be used. This is a thin plate of glass a size larger than Koch's plates, and upon it are scratched squares, each square being divided into nine smaller squares. The Wolfhugel plate is superimposed. 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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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyorkgpputnamsso
