Elementary text-book of zoology . elementarytextbo0101clau Year: 1884 206 PBOTOZOA. 1. The SchizomycetidcB* (Bacteria) are small globular or rod-shaped bodies which are found in decaying matter, and are especially numerous on the surface of putrefying fluids, where they give rise to a slimy film (fig. 148). They are most nearly allied to the fungus of yeast, with which they also agree in their manner of nourishment, in that they make use of ammonia and organic com- pounds containing carbon. Like the yeast fungus they excite and maintain the fermentation or, as may happen, putrefaction of orga
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Elementary text-book of zoology . elementarytextbo0101clau Year: 1884 206 PBOTOZOA. 1. The SchizomycetidcB* (Bacteria) are small globular or rod-shaped bodies which are found in decaying matter, and are especially numerous on the surface of putrefying fluids, where they give rise to a slimy film (fig. 148). They are most nearly allied to the fungus of yeast, with which they also agree in their manner of nourishment, in that they make use of ammonia and organic com- pounds containing carbon. Like the yeast fungus they excite and maintain the fermentation or, as may happen, putrefaction of organic matter by with- drawing its oxygen or by attracting oxygen from the air (reduction or oxyda- tioii ferments). But they are clearly separated from the fungi by their deve- lopment, for they increase by dicidiitr/ into tn-o Italrcs, while the yeast fungus (SuccJiaromyccs, Hurmisciuiii) forms buds which separate off as spores. The transverse division takes place, after the cell has become elongated, by a con- striction of the protoplasm and by the secretion of a cross partition wall. The daughter-cells either divide at once, or remain united and produce chains of Bacteria (filiform Bacteria) by afresh fission. Sometimes the successive genera- tions of cells remain connected by a gelatinous substance, and so produce irre- gular shaped gelatinous masses (zoof/loea). Sometimes they become free and are dispersed in swarms. They may also settle on the bottom in the form of a a /° r, ^ S° . .- 'j WW, (-t > * i s ft'^'/J v ft e 't! . . . • i. v»*y