PLATE 28. 



Bacterium syncyaneum (Ehrenb.). Lehm. and Neum. 



(Bac. cyanogenes Fliigge ; 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°. X 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. 



