. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. REPRODUCTION OF BACTERIA 26? spores are frequently located in special parts of the cell, giving the spore-forming individuals a characteristic appearance, as in Bacillus tetani, where they occupy a dilation of one end (Fig. 145, a). In certain forms ( Bacillus amylohacter) more than one spore may be developed by each individual. Bacterial spores are often very resistant to extremes of temperature, and can indeed in some cases ( Bacillus siiblilis) withstand pro- longed boiling. Most sorts of Bacteria
. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. REPRODUCTION OF BACTERIA 26? spores are frequently located in special parts of the cell, giving the spore-forming individuals a characteristic appearance, as in Bacillus tetani, where they occupy a dilation of one end (Fig. 145, a). In certain forms ( Bacillus amylohacter) more than one spore may be developed by each individual. Bacterial spores are often very resistant to extremes of temperature, and can indeed in some cases ( Bacillus siiblilis) withstand pro- longed boiling. Most sorts of Bacteria live a free life in water, earth, etc. Many exert a very beneficial action in promoting decay and main-. O^ Fig. 144.—Various Bacteria (magnified about 1,000 times), a, Slaphylo- cocciis aureus ; b, Streptococcus pyogenes ; c, Pneuinococcus \ d, Bacillus anthracis ; e, B. typhosus ; /, B. tetani ; g, Microspora comma ; h, Spi- rillum of relapsing fever (possibly Protozoal) ; A, Spirillum rubrum; I, Pseudomonas spp. j represents a blood corpuscle on the same scale, and the line below, the width of a fine human hair, or about half the thickness of a sheet of newspaper. (a-h from Muir and Ritchie ; k-l after Engler and Prantl.) taining the circulation of nitrogen and carbon dioxide in nature, whilst a small number are extremely harmful, living as parasites on higher animals and plants, and causing such diseases as typhoid, cholera, plague, etc. WTiilst some, such as Bacillus subtilis, which is found in infusions of hay, etc., require a free supply of ox3^gen (aerobic species), others, such as the organism responsible for lock-jaw (Bacillus tetani), will grow only in the almost complete absence of oxygen (anaerobic species). Hence the value of oxidising agents ( peroxide of hydrogen) for the cleansing of wounds,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illus
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