. The principles of bacteriology; a practical manual for students and physicians. Bacteriology. BACTERIUM ANTHRACIS 559 roundings are altered, continue in this living, though inactive, condition for a very long time. If again placed under favor- able conditions, each spore will germinate into a mature cell,, and the same series of changes will be repeated until the surroundings become again gradually unfavorable to develop- ment, when spore-formation again takes place. Spore forma- tion occurs only at temperatures ranging from 18° to 43° C.; ° C. being the optimum. Under 12° C. they are no
. The principles of bacteriology; a practical manual for students and physicians. Bacteriology. BACTERIUM ANTHRACIS 559 roundings are altered, continue in this living, though inactive, condition for a very long time. If again placed under favor- able conditions, each spore will germinate into a mature cell,, and the same series of changes will be repeated until the surroundings become again gradually unfavorable to develop- ment, when spore-formation again takes place. Spore forma- tion occurs only at temperatures ranging from 18° to 43° C.; ° C. being the optimum. Under 12° C. they are not formed. This organism does not form spores in the tissues of the living animal, its usual condition at this time being Fig. 98. Colony of bacterium anthracis on agar-agar, that of short rods; occasionally, however, somewhat longer forms may be seen. The bacterium of anthrax is not motile. Colonies of this organism, as seen upon agar-agar, present a typical appearance, from which they have been likened unto the head of Medusa. From a central point, which is more or less dense, consisting of a felt-like mass of long threads irregularly matted together, the growth continues outward upon the surface of the agar-agar (Fig. 98.) It is made up of wavy bundles in which the threads are seen to lie parallel or are twisted in strands like those of a rope;. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Abbott, Alexander Crever, 1860-1935. Philadelphia, Lea & Febiger
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