PLATE 67.

Actinomyces chromogenes. Gasperini.

I. Gelatin stab culture, six days at 22°.
II. Agar streak culture, six days at 22°.
III. Agar stab culture, six days at 22°.
IV. Agar stab culture, six days at 22°.
V. Gelatin plate, eight days at 22°.

Appearance upon white background.

Stab canal.
Surface growth.
Natural size.

VI. Gelatin plate, eight days at 22°. Natural size. Appearance upon dark background.

VII. Gelatin plate, eight days at 22°. × 60. Part of a superficial colony.

VIII. Agar plate, four days at 22°. X 60. Superficial and deep colony.

IX. Potato culture, three days at 22°. Natural size.

X. Microscopic preparation. three days at 22°. X about 1000.

Pure culture in bouillon,

Stained with fuchsin.

PLATE 68.
Varia.

I. Bacterium tussis convulsivæ L. and N. From mucus, coughed up by a child with whooping-cough. 1000. Ordinary fuchsin stain.

X

II. Bact. ulceris cancrosi (Kruse) L. and N. Section of an untreated soft ulcer of twelve days' duration. Stained according to Unna. (Copied from Peterson, über Bacillenfund bei Ulcus molle, C. B. XIII, Tafel 4.)

III. Streptococcus meningitidis cerebrospinalis (Weichselbaum). Lehm. and Neum. Smear preparation from meningeal exudate. Pus cells with flattened diplococci. (Copied after Jäger, Zeitschrift für Hygiene, Bd. 19, Tafel VI, Fig. 3.) X 1000.

IV. Streptococcus meningitidis cerebrospinalis. Pure culture, grown from cerebrospinal fluid.

X 1000.

V. Bacterium influenza (R. Pfeiffer) Lehm. and Neum. Smear preparation from nasal secretion. X 1000. Stained with fuchsin.

Bacillus gangrænæ pulpæ. Arkövy.

VI. Gelatin stab culture, ten days at 22°. The little hairs along the stab canal often become much longer. VII. Agar plate, three days at 37°.

perficial colonies.

Natural size. Su

VIII. Potato culture, ten days at 22°. The wrinkling of the surface suggests the culture of the mesentericus.

IX. Microscopic preparation. X 1000. Stained with fuchsin. Before spore-formation.