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Bacterium typhi. Eberth. Gaffky. (Typhoid Bacillus.)

I. Gelatin plate, eight days at 22°. X 90. Superficial colony. Compare also Plate 19, VI, VII.

II. Gelatin plate, eight days at 22°. X 150. Superficial colony.

III. Gelatin plate, four days at 22o. Natural size.
IV. Agar plate, four days at 22°. Natural size.

V. Agar plate, four days at 22° X 60. Deep colonies.

VI. Agar plate, four days at 20°. X 60. Superficial colony.

VII. Potato culture, five days at 22o. VIII. Microscopic preparation. Pure culture from agar plate. X 1000.

IX. Microscopic preparation. Bacilli with flagella. Copied after Fränkel and Pfeiffer. “Atlas der Bakterienkunde," Plate 54, III.

X. Microscopic preparation. Long threads thickly beset with flagella. X 1500. Stained by Löffler's method.

XI. Microscopic preparation of Bacterium typhi murium Löffler, with flagella and capsule. "X 1500. Stained by Löffler's method.

Bacterium coli (Escherich). L. and N.

I. Gelatin stab culture, ten days at 22o.

II. Gelatin streak culture, four days at 22°. In nature is transparent, resembling mother-of-pearl in iridescence. Compare also Plate 16, VI.

III. Agar streak culture, four days at 22o. Compare also Plate 16, v.

IV. Agar stab culture, two days at 22°. Stab canal.

V. Agar stab culture, two days at 22o. Surface growth.

VI. Agar plate, four days at 22o. x 60. Deep colonies. Compare also Plate 14, vi.

VII. Agar plate, four days at 22°. X 60. Part of a superficial colony. May also occasionally present forms like the bacillus acidi lactici. Compare Plate 12, iv; Plate 14, vi; Plate 17, vi. VIII. Agar plate, three days at 22°. Natural size.

IX. Potato culture, five days at 22o. May also be paler or more deeply colored.

X. Bacteria with long flagella of Bacterium brassica acida. X 1000. Stained according to Löffler.

XI. Bacterium of pigeon diphtheria surrounded by flagella. X 1000. Stained according to Löffler.

XII. Bacteria with one flagellum, rarely two flagella, of Bact. coli 3 unipolaris. X 1000. Stained according to Löffler.

X.

XI.

XII.

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