PLATE 7. Micrococcus tetragenus. Koch. Gaffky. I. Agar streak culture, five days at 37°. II. Gelatin stab culture, ten days at 22°. Stab canal. Characteristic nail-head form. III. Gelatin stab culture, ten days at 22°; surface growth. In the reproduction the color has turned out brown, but should be white. IV. Agar stab culture, six days at 37°. Surface growth. V. Agar stab culture, six days at 37°. The growth along the stab is not always so luxuriant. VI. Agar plate, five days at 37°. Natural size. VII. Gelatin plate, eight days at 22°. The colonies are naturally pure white. Natural size. VIII. Gelatin plate, eight days at 22°. X 60. The larger colony is superficial; the smaller, deep. IX. Microscopic preparation. From a two-days'-old agar culture. × 800. There are not always found tetrads alone, often also single cocci. X. Potato culture, seven days at 37°. XI. Microscopic picture. Tetrads before, during, and after division; highly magnified. PLATE 8. Micrococcus pyogenes a aureus. (Rosenbach.) Lehm. and Neum. (Staphylococcus aureus Ros.) I. Gelatin stab culture, six days at 22°. III. Agar stab culture, five days at 22°. Stab canal. IV. Agar stab culture, five days at 22°; surface growth. V. Agar plate culture, six days at 22°, natural size. Superficial and deep colonies. VI. Agar plate, six days at 22°. X 60. Small superficial colony. VII. Gelatin plate, four days at 22°, natural size. Superficial and deep colonies. VIII. Gelatin plate, four days at 22°. × 60. Superficial and deep colonies. IX. Potato culture, six days at 22°. X. Microscopic preparation. X 1000. From an agar culture, two days old, at 22°. XI. Microscopic preparation. Single cocci, before, during, and after division. × 1500. |