. 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. 14 BACTERIOLOGY. The fission by which the cooci increase may take place in one chrection only, and if the two resulting cells remain attached to each other they form a dijdococcm. If these two cells again dhide, and the resulting cells remain hnked together, we get a chain or rosary, termed streptococcus. These chains may consist of a few individuals linked together, or of several hundreds, in which case the chains are
. 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. 14 BACTERIOLOGY. The fission by which the cooci increase may take place in one chrection only, and if the two resulting cells remain attached to each other they form a dijdococcm. If these two cells again dhide, and the resulting cells remain hnked together, we get a chain or rosary, termed streptococcus. These chains may consist of a few individuals linked together, or of several hundreds, in which case the chains are generally curved or twisted. When the division occurs in two directions, so that four cocci result, a tetrad or mensmopedia is formed ; when in three directions, one coccus divides into eight, and the result is a packet form or sarcinacoccus. Immediately after division, the daughter cells are not perfectly circular, but are flattened or facetted where they are opposite to. Fig. 1.—Ascococous Billkothh, x 65. [After Cohn.] each other. They gradually become rounded off, and each daughter cell is then ready to divide in its turn. In other cases the cocci after division only form irregular heaps or collections like bunches of grapes. This form is sometimes distinguished as staphylococcus, but it cannot be considered an important feature. When we find irregular masses of cocci united by intercellular svibstance and embedded in a tough gelatinous matrix, the form is described as ascococcus. Another type is the rod, characteristic of hacteriam and bacillus. The rods may vary considerably in length. The very short rods with rounded ends are difficult to distinguish from the oval cocci, but differ in that a rod, however short it may be, must have two sides parallel. The vibrio or bent rod may be considered as the connecting link between the rods and the corkscrew forms or. Please note that these images are extracted from scanned page images that may have been digitally enhanced for re
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