82 



ESSENTIALS OF BACTERIOLOGY. 



Spores. Are very resistant ; are colored in the manner de- 

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



Bacillus Megaterium (de Bary). 



Origin. Found on cooked cabbage and garden soil. 



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

 2.5 p. Thick rounded ends. Chains with ten or more members 

 often formed ; granular cell contents. 



Properties. Abundant spore formation ; very slow movement ; 

 slowly dissolves gelatine. 



Growth. Strongly ajrobic ; grows quickly, and best, at a tem- 

 perature of 20 C. 



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

 the gelatine. Under microscope irregular masses. 



FIG. 45. 



Bacillus Megaterium, with spores. 



Stab Culture. Funnel-shaped from above downwards. 



Potato. Thick growth with abundance of spores. 



Bacillus Eamosus. 



Syn. Bac. Mycoides (Fliigge). Wurzel or root badllus. 



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 chainSc 



