Explanation of Plate 24. 



BACTERIUM SYNCYANEUM. (Ehrenb.) Lehm. and Neum. 

 (Bacillus cyanogenes Fliigge ; blue milk. ) 



I.-III. Potato cultures, three to ten days at 22. 

 Potatoes of different kinds inoculated with the 

 same culture. The differences in color may be 

 still more manifold. 



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

 V. Agar plate, three days at 22 . x 60. On the right 



deep-seated, on the left superficial colonies. 

 VI. Gelatin plate, three days at 22. Natural size. 

 VII. Gelatin plate, eight days at 22. Natural size. 

 View of the colonies against a white back- 

 ground. 



VIII. Gelatin plate, three days at 22. x60. Above, 

 superficial; below, deep-seated colonies. 



