PLATE 28.

Bacterium syncyaneum (Ehrenb.). Lehm. and Neum. (Bac. cyanogenes Flügge; Blue Milk.)

I-III. Potato cultures, from three to ten days at 22°. Many varieties of potato inoculated with the same culture. The differences in colors may be still more numerous.

IV. Agar plate, three days at 22°. Natural size.

V. Agar plate, three days at 22°. × 60. To the right, deep; to the left, superficial colonies.

VI. Gelatin plate, three days at 22°. Natural size. VII. Gelatin plate, eight days at 22°. Natural size. Appearance of colonies upon a white background.

VIII. Gelatin plate, three days at 22°. X 60. Above, superficial; below, deep colonies.