NON-PATHOGENIC BACTERIA 



93 



becoming opaque. The border is ciliated; little projections 

 evenly arranged. 



Potato. A white covering at first, which then changes to a 

 rough brown skin; the skin can be detached in long threads. 



Temperature. Spores at ordinary temperature. 



Spores. Are very resistant; are colored in the manner 

 described in first part of the book for spores in general. 



Bacillus Megaterium (de Bary) (Fig. 50). Origin. 

 Found on cooked cabbage and garden-soil. 



Fig. 50. Bacillus megaterium, with spores. 



Eorm. Large rods, four times as long as they are broad, 

 2.5 /*. Thick rounded ends. Chains with ten or more members 

 often formed; granular cell contents. 



Properties. Abundant spore formation; very slow movement; 

 slowly dissolves gelatin. 



Growth. Strongly aerobic; grows quickly and best at a 

 temperature of 20 C. 



Plate Colonies. Small, round, yellow points in the depth of 

 the gelatin. Under microscope, irregular masses. 



Stab-culture. Funnel-shaped from above downward. 



Potato. Thick growth with abundance of spores. 



Bacillus Ramosus. Synonyms. Bacillus mycoides 

 (Fliigge); Wurzel or root bacillus. 



