. Manual of bacteriology. Bacteriology. THE CHOLERA SPIRILLUM. 409 cases, it will be found that these organisms are present in enor- mous numbers in almost pure culture, and that most of the spi- rilla lie with their long axes in the same direction, so as to give the appearance which Koch compared to a school of fish in a stream. They possess very active motility, which is most marked in the single forms. When stained by the suitable methods they are seen to be flagellated. Usually a single terminal flagel- lum is present at one end only (Fig. 139). It is very delicate,. Fig. 138. — Cholera sp
. Manual of bacteriology. Bacteriology. THE CHOLERA SPIRILLUM. 409 cases, it will be found that these organisms are present in enor- mous numbers in almost pure culture, and that most of the spi- rilla lie with their long axes in the same direction, so as to give the appearance which Koch compared to a school of fish in a stream. They possess very active motility, which is most marked in the single forms. When stained by the suitable methods they are seen to be flagellated. Usually a single terminal flagel- lum is present at one end only (Fig. 139). It is very delicate,. Fig. 138. — Cholera spirilla, from a culture and measures four or five times ofagar of twenty-four hours'growth. Stained with weak carbol-fuchsin. X 1000. the length of the organism. In some varieties, however, there may be a flagellum at both ends, or more than one may be present ; cultures obtained at differ- ent places have shown considerable variations in this respect. ^.^, % */., *> - *% Fig. 139.— Cholera spirilla stained to show the terminal flagella. X 1000. Fig. 140. — Cholera spirilla from an old agar culture, showing irregularities in size and shape, with numerous faintly stained coccoid bodies — involution forms. Stained with fucllsin. X 1000. Cholera spirilla do not form spores. In old cultures, however, small, rounded, and highly refractile bodies may be found in the organisms, which have been regarded by Hueppe as " arthro- spores," but which are in reality merely the result of degenera-. 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 Muir, Robert, 1864-; Ritchie, James, 1864-1923; Harris, Norman MacLeod. New York, The Macmillan Company; London, Macmillan
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