Corynebacterium pseudodiphtheriticum. (HofmannWellenhof.) Lehm. and Neum. Corynebacterium xerosis. (Kuschbert, Neisser.) Lehm. and Neum.

I. Coryneb. diphtheria. Plate cultures (Ascitesfluid-agar and glycerin-agar). × 60. Superficial colonies, twenty-four hours at 37°. Cultures of different origin.

II. Coryneb. diphtheria. Plate culture (glycerinagar). 60. Superficial colonies, forty-eight hours at 37°. The same culture as I, g, h.

III. Coryneb. diphtheriæ. Plate culture (ascitesfluid-agar). X 60. Superficial colony, five days at 37°. The same culture as I, c, e, and Plate 58, II.

IV. Coryneb. pseudodiphtherit. Plate culture (glycerin-agar). 60. Superficial colonies, forty-eight hours at 37°. The same culture as Plate 58, III.

V. Coryneb. xerosis. Plate culture (glycerin-agar). X 60. Superficial colony, forty-eight hours, at 37°. Dry, dull, and very opaque. The same culture as Plate 58, IV,

VIII b.

VI. Coryneb. diphtheriæ. fluid-agar).

Plate culture (ascites60. Superficial colonies, forty-eight hours at 37°. The same culture as I, f, l, and Plate 58, I, VII a. VII. Coryneb. diphtheriæ. Plate culture. The same as VI, but ten days old.

VIII. Coryneb. xerosis. Plate culture (glycerin-agar). X 60. Superficial colonies, forty-eight hours at 37°. The

Corynebacterium diphtheria (Klebs, Löffler). L. and N. Corynebacterium pseudodiphtheriticum. (HofmannWellenhof.) Lehm. and Neum.

Corynebacterium xerosis (Kuschbert, Neisser). Lehm. and Neum.

I. Coryneb. diphtheria. Glycerin-agar, forty-eight hours at 37°. 1000. Stained with fuchsin. Corresponds to Plate 58, II, VII b; and Plate 59, II.

II. Coryneb. diphtheria. Glycerin-agar, forty-eight hours at X 1000. Stained with fuchsin. Corresponds to Plate 58, 1, VII a; and Plate 59, vi.

37°.

III. Coryneb. diphtheria. Glycerin-agar, forty-eight hours at 37°. X 1000. Stained with fuchsin.

IV. Coryneb. diphtheria. Glycerin-agar, forty-eight hours at 37°. X 1000. Stained with fuchsin.

V. Coryneb. pseudodiphtherit. Glycerin-agar, forty-eight hours at 37°. X 1000. Stained with fuchsin.

VI. Coryneb. pseudodiphtherit. Glycerin-agar, forty-eight hours at 37°. X 1000. Stained with fuchsin. Corresponds to Plate 58, III, VIII a; Plate 59, I, IV.

VII. Coryneb. xerosis. Glycerin-agar, forty-eight hours at 37°. X 1000. Stained with fuchsin. Corresponds to Plate 58, iv, VIII b; and Plate 59, v.

VIII. Coryneb. xerosis. Glycerin-agar, forty-eight hours at 37°. X 1000. Stained with fuchsin.

IX. Coryneb. xerosis. Glycerin-agar, forty-eight hours at 37°. X 1000. Stained with fuchsin. Corresponds to Plate 58, vIII c.

X. Coryneb. diphtheria. Bovine blood-serum, solidified at 100°, eighteen hours at 35°. 1000. Staining of Neisser's granules. The polar staining is characteristic. Corresponds to figure I.

XI. Coryneb. pseudodiphtherit. Bovine blood-serum, solidified at 100°, eighteen hours at 35°. 1000. Staining of Neisser's granules. These occur also in many varieties of pseudodiphtheria, but not with such regularity at both poles.

XII. Coryneb. diphtheria. Glycerin-agar, four days at 37°. 1000. Stained with fuchsin. True branching.

XIII. Coryneb. diphtheria. Single organisms, highly magnified, schematic.

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