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Streptococcus pyogenes. Rosenbach.
I. Agar streak culture, ten days at 37°.

II. Gelatin stab culture, six days at 22°. So vigorous a growth does not often occur.

III. Agar stab culture, six days at 37°. Stab canal.
IV. Agar stab culture, six days at 37°. Surface growth.

V. Gelatin plate, six days at 22o.

VI. Gelatin plate, six days at 22°. x 70. Somewhat abnormal form with irregular borders. The larger colonies are superficial; the smaller, deep.

VII. Gelatin plate, six days at 22o. X 70. Common form. The upper, superficial; the lower, deep.

VIII. Agar plate, eight days at 37°. X 50. Larger colony superficial; smaller colonies, deep.

IX. Microscopic preparation from a two days' bouillon culture at 37° X 700. The individual cocci are usually more regularly round.

X. Microscopic preparation from a two days' agar culture. Shorter chains. X 1000.

XI. Microscopic preparation, designated Streptococcus conglomeratus. Smear preparation from the blood of the spleen from a case of scarlatina. Copied from Kurth (Kaiserl. Gesundheitsamt., Bd. vii, cfr. xv, 6 and 8).

XII. Chains of streptococci, before and during division. Highly magnified.

Streptococcus lanceolatus. Gamaleia. (Diplococcus

pneumoniæ A. Fränkel.) (Pneumococcus.)
I. Gelatin stab culture, ten days at 22o.
II. Agar streak culture, four days at 37°.
III. Agar stab culture, four days at 37°. Stab canal.

IV. Agar stab culture, four days at 37°. Surface growth.

V. Agar plate, three days at 37°. Natural size.

VI. Agar plate, three days at 37°. X 50. Superficial colony. The darker colony lies near the surface.

VII. Agar plate, three days at 37°. x 50. Deep colonies.

VIII. Gelatin plate, eight days at 22o. The upper colony is superficial; the lower ones, deep.

IX. Smear preparation from pneumonic sputum. X 1000.

X. Pure culture from a three days' old agar plate. X 1000.

XI. Microscopic preparations: (a) Diplococci as single pairs and in chains. Highly magnified. (6) Diplococci surrounded by gelatinous capsules.

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X.

Lith. Anst E Reichhold München.

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