Elementary text-book of zoology . elementarytextbo0101clau Year: 1884 /° r, ^ S\\° . .- 'j WW,(-t > \* i s ft'^'/J v ft e 't! . . . • i. v»*y ff' FIG. 148.—Scliizomycetes (after F. Cohn). a, Micrococcus. I, Bacterium termo, bacteria of putrefying fluids, both in the motile and zoogloea form. granular precipitate, as soon as the nourishment in the fluid is exhausted. The greater number have a motile and a motionless stage ; in the first they rotate themselves about their long axis, but are also able to bend and extend, but never to serpentine. Their activity seems to be connected with th
Elementary text-book of zoology . elementarytextbo0101clau Year: 1884 /° r, ^ S\\° . .- 'j WW,(-t > \* i s ft'^'/J v ft e 't! . . . • i. v»*y ff' FIG. 148.—Scliizomycetes (after F. Cohn). a, Micrococcus. I, Bacterium termo, bacteria of putrefying fluids, both in the motile and zoogloea form. granular precipitate, as soon as the nourishment in the fluid is exhausted. The greater number have a motile and a motionless stage ; in the first they rotate themselves about their long axis, but are also able to bend and extend, but never to serpentine. Their activity seems to be connected with the presence of oxygen. Owing to the absence of sexual reproduction, the division of Bacteria into genera and species is beset with such difficulty that we must content ourselves with establishing, in an artificial fashion, form species and physiological species and varieties without always being able to demonstrate their independence. F. Cohn distinguishes four groups :—(1) Globular Bacteria, Mirrococciix (Jforta* and Mi/codcr-ma); (2) Rod Bacteria (Bacterium}; (3) Filiform Bacteria (Bacillus and Vibrio'); (4) Spiral Bacteria (Spirillum and Spirocheeta). The Globular Bacteria are the smallest forms, and only exhibit molecular movements. They cause various forms of decomposition, but not putrefaction. * F. Cohn, 'Beitrage zur Biologic der Pflanzen.' Heft 2 and 3, 1872 and 1875. '; Untersuchungen iiber Bakterien,' 1, 2, and 3 (Bacterium termo). Com- pare further the works of Eberth and Klebs.
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