. Bacteriology and the public health. Bacteriology; Public health. 454 APPENDIX parent organism which found its way thither from the drop of con- taminated water. The next step is to examine these quantitatively and qualitatively. 1. Naked-Eye Observation of the Colonies.—By this means, at the very outset certain facts may be obtained, viz., the size, elevation, configura- tion, margin, colour, grouping, number, and kinds of colonies, all of which facts are of importance, and assist in final determination as to the quantity and character of the organisms present in the original drop of. Fifi.
. Bacteriology and the public health. Bacteriology; Public health. 454 APPENDIX parent organism which found its way thither from the drop of con- taminated water. The next step is to examine these quantitatively and qualitatively. 1. Naked-Eye Observation of the Colonies.—By this means, at the very outset certain facts may be obtained, viz., the size, elevation, configura- tion, margin, colour, grouping, number, and kinds of colonies, all of which facts are of importance, and assist in final determination as to the quantity and character of the organisms present in the original drop of. Fifi. 89.—A Diagram of Colonies of Bacteria on a Gelatine Plate. water. Moreover, in the case of gelatine medium (owing to the fact that it is liquefiable by ferments), one is able to observe whether or not there is present what is termed liquefaction of the gelatine. Some organisms produce in their development a peptonising ferment which breaks down gelatine into a fluid condition. Many have not this power, and hence the characteristic is used as a diagnostic feature. 2. The Microscopic Examination of Colonies (under low magnification, X 60-100) confirms or corrects that which has been observed by the naked eye. Micro-organisms, when growing in colonies, produce cultivation features which are peculiar to themselves (especially is this so when. 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. Philadelphia, P. Blakiston's Son & Co.
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