A chapter on cholera, for lay readers History, symptoms, prevention, and treatment of the disease . r means of infectionother than the bacilli of the laboratory cultureswas found to be possible. Morphological Characters of the Germ. The bacilli have the form of slightly-curvedrods (hence the name comma bacillus) withslightly-rounded ends (see illustration), andmeasure from .000031 to .000078 inch in lengthand from .000011 to .000015 inch in small rods are often seen to be joinedend to end, when .they have the form of theletter S. In older growths on nutrient culturemedia or fluid
A chapter on cholera, for lay readers History, symptoms, prevention, and treatment of the disease . r means of infectionother than the bacilli of the laboratory cultureswas found to be possible. Morphological Characters of the Germ. The bacilli have the form of slightly-curvedrods (hence the name comma bacillus) withslightly-rounded ends (see illustration), andmeasure from .000031 to .000078 inch in lengthand from .000011 to .000015 inch in small rods are often seen to be joinedend to end, when .they have the form of theletter S. In older growths on nutrient culturemedia or fluids they are seen to have a spiralshape (hence the name cholera spirillum),and, under certain circumstances, the singlerods and spirilla possess a lively motion. Insuitable nutrient media they grow in certaincharacteristic ways, which serve to distinguishthem from all other disease germs. When Causes of the Disease. 25 they are planted on gelatin plates, and theseare kept at a temperature of 22° C. (72° F.)in a suitable oven, after a lapse of twenty-four hours there is seen, with the naked eye,. Cover-Glass Preparation Cholera Bacilli. Gelatin Culture,Two Days Old. Magnified 1000 x (Fraenkel and Pfeiffer). in the depth of the gelatin, small, white the growth continues the gelatin has theappearance of being rilled with many small,funnel-shaped air-holes, at the bottoms ofwhich are to be seen the growing colonies as 26 A Chapter on Cholera for Lay Readers. small, white masses. Around the growingcolonies the gelatin becomes liquefied. Whenexamined under the microscope, the coloniesgrowing on the gelatin plate present a pecu-liar characteristic appearance. They are of abright-white or pale-yellow color, of an irreg-ular, rounded shape, with uneven, irregularmargins. As the colonies grow they assumean uneven, granular appearance, and lookas if they were composed of minute particlesof glass or crystals. At the same time, theyoften present a delicate, reddish tinge foundin no
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectcholera, bookyear1893
