. Bacteriology in medicine and surgery. A practical manual for physicians, health officers, and students. Bacteriology. 572 BACTERIOLOGY. dark-yellow or brown in color, and forms occur which are absolutely unlike the typical cholera colonies. In gelatin stick cultures the growth is at first thread,-like and uncharacteristic. At the end of twenty-four to thirty-six hours a small, funnel-shaped depression ap- pears on the surface of the gelatin, which soon spreads out in the form of an air-bubble above, while below this is a whitish, viscid mass. Later, the funnel in- creases in depth and diamet
. Bacteriology in medicine and surgery. A practical manual for physicians, health officers, and students. Bacteriology. 572 BACTERIOLOGY. dark-yellow or brown in color, and forms occur which are absolutely unlike the typical cholera colonies. In gelatin stick cultures the growth is at first thread,-like and uncharacteristic. At the end of twenty-four to thirty-six hours a small, funnel-shaped depression ap- pears on the surface of the gelatin, which soon spreads out in the form of an air-bubble above, while below this is a whitish, viscid mass. Later, the funnel in- creases in depth and diameter, and at the end of from four to six days may reach the edge of the test-tube; Fig. Cholera colony in gelatin. X 30 diameters. (Donham.) in from eight to fourteen days the upper two-thirds of the gelatin is completely liquefied. (See Fig. 79 and Fig. 31, page 230.) Freshly isolated cholera vibrios liquefy gelatin more rapidly than old laboratory cul- tures; a certain variation in the characteristic liquefac- tion of the gelatin even in fresh cultures under some circumstances should be borne in mind in making a diagnosis. Such variations in cultural peculiarities occur also with other bacteria, and only the sum of all the characteristics taken together enables a positive diagnosis to be established. Upon the surface of agar the comma bacillus develops a moist, shining, grayish-yellow layer. Blood-serum is rapidly liquefied at the temperature of the incu-. 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 Park, William Hallock, 1863-1939; Guerard, Arthur Rose, 1851-. New York and Philadelphia, Lea Brothers & Co
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