Vibrio danubicus Heider, Vibrio berolinensis Rubner, Vibrio aquatilis Günther.

I. Vibrio danubicus: Gelatin stab culture, three days at 22°.

II. Vibrio aquatilis: Gelatin stab culture, three days at 22°.

III. Vibrio danubicus: Gelatin plate, three days at 22°. 60. To the right superficial, to the left deep colony.

IV. Vibrio danubicus: Microscopic preparation. Pure culture on agar, twenty-four hours. Stained with fuchsin. X 800.

V. Vibrio berolinensis: Gelatin plate, three days at 22o. × 60. To the right superficial, to the left deep colony. VI. Vibrio berolinensis: Microscopic preparation. Pure culture from agar, twenty-four hours. X 800. Stained with fuchsin.

VII. Vibrio aquatilis: Gelatin plate, three days at 22°. X 60. Deep colonies, swarming outward from one point forming secondary ones.

VIII. Vibrio aquatilis: Microscopic preparation. Pure culture on agar, twenty-four hours at 22°. × 800. Stained with fuchsin.

IX. Vibrio aquatilis: Gelatin plate, three days at 22°. 60. To the right superficial, to the left deep colony.

PLATE 54.

Vibrio albensis. Lehm. and Neum. (Phosphorescent

Elbe Vibrio.)

I. Gelatin stab culture, twenty-four hours at 22°.
II. Gelatin stab culture, four days at 22°.
III. Gelatin stab culture, ten days at 22°.
IV. Indol reaction after ten days.
with dilute sulphuric acid, warmed.

V. Gelatin plate, three days at 22°. ficial colony.

Bouillon culture

× 60. Super

VI. Gelatin plate, three days at 22°. X 60. Deep colonies.

VII. Gelatin plate, thirty-six hours at 22°. Natural size.

VIII. Microscopic preparation. Pure culture from agar,