. Bacteriology in medicine and surgery. A practical manual for physicians, health officers, and students. Bacteriology. 226 BACTERIOLOGY. multiplies clusters are formed about it at the spot where it was fixed at the moment of solidification. The num- ber of colonies of bacteria (Fig. 28) thus indicate to us roughly the number of living bacteria in the quan- tity of fluid added to the liquid agar. Nutrient gelatin is used exactly as agar, except that, as it does not congeal until cooled below 22° C, we have no fear of Fig. Photograph of a large numher of colonies developing in a layer of g
. Bacteriology in medicine and surgery. A practical manual for physicians, health officers, and students. Bacteriology. 226 BACTERIOLOGY. multiplies clusters are formed about it at the spot where it was fixed at the moment of solidification. The num- ber of colonies of bacteria (Fig. 28) thus indicate to us roughly the number of living bacteria in the quan- tity of fluid added to the liquid agar. Nutrient gelatin is used exactly as agar, except that, as it does not congeal until cooled below 22° C, we have no fear of Fig. Photograph of a large numher of colonies developing in a layer of gelatin contained iu a Petri dish. Some colonies are only pin point in size; some as large as a pencil. The colonies here appear in their actual size. its cooling too rapidly. In order not only to count the number of colonies which develop, but also to obtain a characteristic growth, it is desirable not to have them too near together. As it is impossible to determine accurately the number in any suspected fluid, it is usual to make a set of four different plates, to each of which a different amount of material is added, so that. 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 Park, William Hallock, 1863-1939; Guerard, Arthur Rose, 1851-. New York and Philadelphia, Lea Brothers & Co
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