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Girst E Reichhold, München.

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 37o. 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. X 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.

Micrococcus pyogenes a aureus. (Rosenbach.) Lehm.

and Neum. (Staphylococcus aureus Ros.) I. Gelatin stab culture, six days at 22o. II. Agar streak culture, five 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 22o, natural size. Superficial and deep colonies.

VI. Agar plate, six days at 22o. x 60. Small superficial colony.

VII. Gelatin plate, four days at 22°, natural size. Superficial and deep colonies.

VIII. Gelatin plate, four days at 22o. x 60. Superficial and deep colonies.

IX. Potato culture, six days at 22o.

X. Microscopic preparation. X 1000. From an agar culture, two days old, at 22o.

XI. Microscopic preparation. Single cocci, before, during, and after division. X 1500.

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