. Pathogenic micro-organisms, including bacteria and Protozoa; a practical manual for students, physicians and health officers. described, or,when that cannot be obtained, a lamp. When temperatures lower than that of the surrounchng air arewanted, heat is reduced by passing a stream of cool water through thewater chamber, which is itself regulated. AVlien very accurateinvestigations are to be made a gas-pressure regulator is added to the 78 PATHOGENIC MICRO-ORGANISMS. thermoregulator. Incubators may be also both warmed and regulatedby electricity. In emergencies, a culture may be developed at
. Pathogenic micro-organisms, including bacteria and Protozoa; a practical manual for students, physicians and health officers. described, or,when that cannot be obtained, a lamp. When temperatures lower than that of the surrounchng air arewanted, heat is reduced by passing a stream of cool water through thewater chamber, which is itself regulated. AVlien very accurateinvestigations are to be made a gas-pressure regulator is added to the 78 PATHOGENIC MICRO-ORGANISMS. thermoregulator. Incubators may be also both warmed and regulatedby electricity. In emergencies, a culture may be developed at the blood temperatureby placing it in a closed jar or bottle which is placed in a larger vesselfilled with water heated at 38° C. By adding a little hot water fromtime to time to the outer vessel the temperature can readily be keptbetween 34° and 38° C, which is sufficiently uniform for bacteria suchas the diphtheria bacilli to grow. A Thermos bottle will answer thepurpose. As a temporary expedient during the night, when haste isnecessary, it is possible, when the culture medium is solid and within a I Fig. 57 Fig. 58.
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