42 



BACILLUS VIOLACEUS. 



VIOLET BACILLUS OF AVATEIJ. 



Origin. Water of the river Spree at Berlin, and of 

 the Thames at London ; also in well water. 



Form. Long, narrow rods, about three times as long 

 as wide ; forms threads. 



Motility. Actively motile. 



Sporulation. Forms median spores. 

 Anilin Dyes. React readily. 

 Growth. Is moderately rapid. 



Gelatin Plates. Irregular colonies, with loose fibrillaled borders. The 

 center shows quite early a violet color. Liquefies. 



Stich Cultures. Funnel-shaped liquefaction along entire line of inocu- 

 lation. A violet sediment collects on the bottom, while the liquefied gekxtin 

 above is perfectly clear. 



Streak Cultures. On agar, forms a thin, moist, bright violet covering. 

 On potatoes, the growth is somewhat slow but very characteristic, forming a 

 bright violet, eventually dark covering On blood serum, the violet color is 

 produced and liquefaction takes place. 



Oxygen requirements. Is a facultative anaerobe. 

 Oxygen is necessary to pigment formation. 



Temperature. Does not grow at higher tem- 

 peratures. 



Behavior to Gelatin. Liquefies. 

 Pathogenesis. Has no effect. 



