. A text-book of bacteriology. Bacteriology. NOT DESCRIBED IN SECTIONS V. AND VI. 411 MICROCOCCUS TETRAGENUS. First described by Grafifky (Fliigge). Obtained by Koch and Gaffky (1881) from a cavity in the lung in a case of pulmonary phthisis. Since found occasionally in normal saliva (three times in fifty persons examined by Biondi), and in the pus of acute abscesses (Steinhaus, Park, Vangel). Rather common in the sputum of phthi- sical cases. Morphology.—Micrococci, having a diameter of about one pc, which divide in two directions, forming tetrads, which are enclosed in a transparent, jeUy-li
. A text-book of bacteriology. Bacteriology. NOT DESCRIBED IN SECTIONS V. AND VI. 411 MICROCOCCUS TETRAGENUS. First described by Grafifky (Fliigge). Obtained by Koch and Gaffky (1881) from a cavity in the lung in a case of pulmonary phthisis. Since found occasionally in normal saliva (three times in fifty persons examined by Biondi), and in the pus of acute abscesses (Steinhaus, Park, Vangel). Rather common in the sputum of phthi- sical cases. Morphology.—Micrococci, having a diameter of about one pc, which divide in two directions, forming tetrads, which are enclosed in a transparent, jeUy-like envelope—especially well developed as seen in the blood and tissues of inoculated animals. In cultures the cocci are seen in the various stages of division, as large single Fio. 96.—Micrococcus tetragenus; section of lung o£ mouse. X 800. (Fliigge.) pairs of oval elements, or groups of four resulting from the trans- verse division of these latter. Stains quickly with aniline colors, and in preparations from the blood of an inoculated animal the transparent envelope may also be feebly stained. Stains also by Gram's method. Biological Characters.—This micrococcus grows, rather slowly, in nutrient gelatin at the ordinary room temperature, without lique- faction of the gelatin. Upon gelatin plates small white colonies are developed in from twenty-four to forty-eight hours, which under the microscope, with a low power, are seen to be spherical or lemon- shaped, finely granular, and with a mulberry-like surface. When they come to the surface they form white, elevated, and rather thick masses having a diameter of one to two milHmetres. In gelatin stab cultures a broad and thick white mass forms upon the 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 Sternberg, George Miller, 1838-1915
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