76 



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. 



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

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

 bers often formed granular cell contents. 



Properties. Abundant spore formation ; very slow movement ; 

 slowly dissolves gelatine. 



Growth. Strongly aerobic ; 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 growths, with abundance of spores. 



Bacillus Ramosus. 



Syn. Bac. 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 



