SOME COMMON BACTERIA SLIGHTLY PATHOGENIC 



99 



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. 39). Origin. 

 Found on rotten cabbage and garden-soil. 



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

 2.5/1. Thick, rounded ends. Chains with ten or more mem- 

 bers often formed; granular cell contents. 



Abundant spore formation; very slow movement. 



Growth. Strongly aerobic; grows quickly and best at a 

 temperature of 20 C. 



Fig- 39. Bacillus megaterium, with spores. 



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

 the gelatin. Under microscope, irregular masses like B. 

 subtilis. 



Stab-culture. Funnel-shaped from above downward. 



Potato. Thick growth with abundance of spores like B. 

 subtilis. 



Bacillus Ramosus. Synonyms. Bacillus mycoides 

 (Fliigge) ; Wurzel or root bacillus. 



Origin. In the upper layers of garden or farm grounds and 

 in water. 



Form. Short rods, with rounded ends, about three times 

 as long as they are thick; often in long threads and chains. 



