. A text-book of bacteriology, including the etiology and prevention of infective diseases and a short account of yeasts, and moulds, haematazoa, and psorosperms. Bacteriology. DESCRIPTION OF SPECIES. 503 grow out into long, apparently uu- jointed threads. They are mostly actively motile, but also occur in zoogloea. The rods and threads are sometimes slightly bent, like Tibrios. They are anaerobic. The shorter rods as a rule swell in the middle, becoming ellipsoidal, lemon,. Fig. 199.—Clostkidium eutykioum. Active stage, (a, 6) Bent rods (vibrio- form) and threads, (c) Short rods, (d) Lon
. A text-book of bacteriology, including the etiology and prevention of infective diseases and a short account of yeasts, and moulds, haematazoa, and psorosperms. Bacteriology. DESCRIPTION OF SPECIES. 503 grow out into long, apparently uu- jointed threads. They are mostly actively motile, but also occur in zoogloea. The rods and threads are sometimes slightly bent, like Tibrios. They are anaerobic. The shorter rods as a rule swell in the middle, becoming ellipsoidal, lemon,. Fig. 199.—Clostkidium eutykioum. Active stage, (a, 6) Bent rods (vibrio- form) and threads, (c) Short rods, (d) Long rods. 3. Spore-formation. C. Spore-germina- tion. (Prazmowski.) or spindle-shaped ; the long rods, and sometimes the short ones, swell at one end ; in either case ellipsoidal spores are developed (Fig. 199). Cultivated in nutrient gelatine, -the medium is liquefied, and a scum formed on the surface. They grow best between 35° and 40° C. The spores are widely distributed in nature, and grow readily on fleshy roots, old cheese, etc. They convert the lactic acid in milk into butyric acid, and produce the ripening of • cheese. They occur also in solutions of starch, dextrine, and sugar, and are the active agents in the fermenta- tionbf sauerkrautand sour gherkins. Bacilliis butyricus (Botkin).— Rods and filaments, spore-formation present. They are anaerobic. Colonies consist of felt-like masses. Inoculated in the depth of gela- tine with 1-5 per cent, of grape- sugar, the growth commences in the lower part of the needle track with abundant formation of gas bubbles and liquefaction of the jelly. In milk there is abundant gas formation, which will break the flasks if closed. They were isolated from milk, earth, and water. Sacillus butyricus (Hueppe).—Rods slightly bent, 21 fi in length, -38 /j. in width, and filaments. Colonies yellowish; rapidly liquefying. Inoculated in the depth of gelatine liquefaction occurs along the track of the needle, and later a wrinkled skin fl
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