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 ju. 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' j like-., 

 subtilis. 



Bacillus Ramosus. Synonyms. Bacillus *mycoides 

 (Fliigge); Wurzel or root bacillus. 



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

 in water. ^N-V-*' 



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

 as long as they are thick; of ten" in long "threads and chains. 



