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Streptococcus pyogenes. Rosenbach.
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.
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.)
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.