. Bacteria : especially as they are related to the economy of nature, to industrial processes and to the public health. Bacteriology; Bacteriology. ^ IA v B. Enteriditis Sporogenes 4 Proteus Vulgaris 4. Liquefying bacteria, , Bacillus fluorescens liquefaciens, B. subtilis, B. mesentericus. 5. Non-liquefying bacteria. 6. Sarcinae, yeasts, and moulds. * The methods adopted for making a quantitative and qualitative examination of sewage are precisely analogous to those used in milk research Dilution with sterilized water previous to plating out on gelatine in Petri dishes is essential (1
. Bacteria : especially as they are related to the economy of nature, to industrial processes and to the public health. Bacteriology; Bacteriology. ^ IA v B. Enteriditis Sporogenes 4 Proteus Vulgaris 4. Liquefying bacteria, , Bacillus fluorescens liquefaciens, B. subtilis, B. mesentericus. 5. Non-liquefying bacteria. 6. Sarcinae, yeasts, and moulds. * The methods adopted for making a quantitative and qualitative examination of sewage are precisely analogous to those used in milk research Dilution with sterilized water previous to plating out on gelatine in Petri dishes is essential (1 to 10,000 c. c. of sterile water, or some equally considerable dilution), otherwise the large numbers of germs would rapidly liquefy and destroy the film. Special methods must be used for the isolation of special organisms, phenol-gelatine, Eisner medium, indol reaction, "shake" cultures, Parietti broth, etc., must often be resorted to for special bacteria. Spores of bacteria may always be numerically estimated by adding the suspected water or sewage to gelatine, and then heating to 8o° C. for ten minutes before plating out. This temperature removes the bacilli, but leaves the spores 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, 1870-1948. London : John Murray
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