Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . Fig. 41.—Sarcina ventriculi from stomach-contents (X 53°) (VanValzah and Nisbet). Form.—Colorless oval cocci, in groups of eight and packetsof eight. Properties.—Does not liquefy gelatin; shows tne reactionof cellulose to iodin. Growth.—^Rapid. At end of thirty-six hours, round, yellowcolonies, from which colorless cocci and cubes are obtained. Habitat.—They are found in many diseases of the stomach,especially when dilatation exists. Also normally; increasedwhen ferment
Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . Fig. 41.—Sarcina ventriculi from stomach-contents (X 53°) (VanValzah and Nisbet). Form.—Colorless oval cocci, in groups of eight and packetsof eight. Properties.—Does not liquefy gelatin; shows tne reactionof cellulose to iodin. Growth.—^Rapid. At end of thirty-six hours, round, yellowcolonies, from which colorless cocci and cubes are obtained. Habitat.—They are found in many diseases of the stomach,especially when dilatation exists. Also normally; increasedwhen fermentation occurs. BACILLUS OF ANTHRAX lOS CHAPTER XVIIBACILLUS OF ANTHRAX Bacillus Anthracis (Rayer and Davaine).—^Rayer andDavaine, in 1850, first described this bacillus; but Pasteur,and Koch, gave it the importance it now has. Synonyms.—Bactericie du charhon (Fr.); Milzhrand bacil-lus (German); bacillus of splenic fever or malignant pustule. Origin.—In blood of anthrax-suffering Fig. -Bacillus anthracis, stained to show the spores (X 1000)(Frankel and Pteiffer). Form.—Rods of variable length, largest of pathogenic or-ganisms 4 At to 10 /i in length, nearly the size of a human blood-corpuscle; broad, cup-shaped ends; in bouillon cultureslong threads are formed, with large oval spores (Figs. 42, 43). Spores.—Single, large, very resistant. Dry heat, 140° C,in three hours; steam in five minutes; necessary to kill. Do io6 ESSENTIALS OF BACTEEIOLOGY not occur in the circulating blood, but develop after death orin artificial media at 30° C. / \ I Fig. 43.—Anthrax bacilli in human blood (fuchsin staining) (Zeiss one-twelfth oil-immersion; No. 4 ocular) (taken from Vierordt).
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