. Pathological technique; a practical manual for workers in pathological histology and bacteriology. Fig. 51.—Micrococcuscatarrhalis colonies onagar (F. T. Lord; photoby L. S. Brown). 2 grams;2 IOO 278 PA THOL O GICAL TE CHNIQ UE. respiratory tract and cannot be distinguished in its mor-phology and staining reactions from the gonococcus or fromthe Diplococcus intracellularis meningitidis (Fig. 53). Theappearances of its colonies on ordinary culture-media are,however, characteristic. They are large, white, of irregularoutline, and have elevated central portions. They are friable,not viscid
. Pathological technique; a practical manual for workers in pathological histology and bacteriology. Fig. 51.—Micrococcuscatarrhalis colonies onagar (F. T. Lord; photoby L. S. Brown). 2 grams;2 IOO 278 PA THOL O GICAL TE CHNIQ UE. respiratory tract and cannot be distinguished in its mor-phology and staining reactions from the gonococcus or fromthe Diplococcus intracellularis meningitidis (Fig. 53). Theappearances of its colonies on ordinary culture-media are,however, characteristic. They are large, white, of irregularoutline, and have elevated central portions. They are friable,not viscid, and grow readily at room-temperature (Fig. 51). Micrococcus TetragentlS.—The colonies are small,white, and elevated. Growth is slow. Morphology.—Micrococci arranged in fours, or tetrads,held together by a gelatinous substance (Fig. 52). Stained by Grams method. Not motile. Gelatin Stab.—Feeble growth in the form of minute spheri-cal masses along the line of stab with a small white, slightlyelevated point at the surface of the medium. The gelatinis not liquefied. ?*F(r.••. .*.«« Fig. 52.—Micrococcus tetragenus in pus from a white mouse; X &l5 (Heim). Agar-agar Slant.—Moist, glistening, grayish-white trans-lucent streak with wavy margins. Potato.—Growth is in the form of a thick, irregular, slimy-looking patch. The growth on agar-agar and on potatomay be drawn into thin threads by the platinum wire. Pathogenesis.—Subcutaneous inoculation of mice andguinea-pigs may lead to a fatal septicemia or only a localpus-formation. Intravenous or intraperitoneal inoculationof rabbits may also produce septicemia and death. PATHOGENIC BACTERIA AND FUNGI. 279 At autopsy the micrococci, arranged in tetrads, are foundin the blood generally, but most numerously in the can readily be demonstrated by cover-glass prepara-tions. Occurrence.— Found not infrequently in phthisical cavi-ties and sputum, occasionally in association with pyogeniccocci in abscesses conne
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