. Elementary text-book of zoology. Zoology. They can only be divided, according to their various methods of development, into chromogenous (pigment), zymogenous (fermentation), and pathogenous (contagion) divisions. The first appear in coloured gelatinous masses and vegetate in the Zoogloeaform, e:;/.. M. prodigiosus Ehbrg. in potatoes, etc., To the Zymogenous belong M. uretc. urine ferment ; to the Pathogenous M. nii-rlnif. the Pox Bacteria, M. xepticux of py;emia, M. dlplithcricHS of diphtheritis. The Rod Bacteria form small chains or threads, and exhibit spontaneous motions, especially in t
. Elementary text-book of zoology. Zoology. They can only be divided, according to their various methods of development, into chromogenous (pigment), zymogenous (fermentation), and pathogenous (contagion) divisions. The first appear in coloured gelatinous masses and vegetate in the Zoogloeaform, e:;/.. M. prodigiosus Ehbrg. in potatoes, etc., To the Zymogenous belong M. uretc. urine ferment ; to the Pathogenous M. nii-rlnif. the Pox Bacteria, M. xepticux of py;emia, M. dlplithcricHS of diphtheritis. The Rod Bacteria form small chains or threads, and exhibit spontaneous motions, especially in the presence of abundant nourishment and oxygen. Here belongs Bacterium termo Ehrbg. distributed in all animal and vegetable infusions and the necessary ferment in putrefaction, just as yeast is in alcohol fermentation ; also B. Lineula Ehrbg. of considerable size, which exists in spring water and in standing water, in which there are no products of putrefaction, and, as well as the former, has a zoogloea jelly. Another Bacterium form acts as ferment of lactic acid. ^ according to Hoffman. Of the Filiform Bacteria the motile Bacillus (vibrio) Kiibtilix Ehrbg. occasions butyric acid fermentation, but is also found in infusions together with B. term a. Very nearly allied and hardly to be distinguished is the motionless Bacillux (inthracis of inflammation of the spleen. Vibrio ruaula and si'rpeit* are charac- terised by constant undula- tions of the chain. Finally these lead to the spiral forms of which Spirocluct<i' resembles a long and flexi- ble but closely wound, and Spirillum, a thick, short, and coarse screw. Spiril- lum tcnax, undula, volutans, the last with a flagellum at each end. 2. The Greyarinidte * are unicellular organisms which live as parasites in the intestine, and in the internal organs of the lower animals. The body is fre- quently elongated like that of a worm, and consists of a granular viscid central mass surrounded by a delicate external membrane (sometime
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
