262 BACTERIOLOGY 



152. B. violaceus Jordan 



B. violaceus-laurentius Jordan: Mass. State Board of Health, 1890, 838. 



Morphology. Bacilli 0.7 : 3.0-4.6 /x. In bouillon the pigment is formed only 



in the presence of nitrates. Nitrates reduced. 

 Potato. Growth violet. 

 Milk. Coagulated, acid. {Indol produced, pepton rosolic acid unchanged^ 



Dyar.) 

 Habitat. Water. 



153. B. lividus Fliigge-Proskauer 



Zeitsch. f. Hygiene, 1887, n, 463. 



Morphology. Bacilli slender, medium-sized. 



Gelatin colonies. Resemble drops of ink ; gelatin liquefied slowly, with a 



bluish violet deposit. 

 Gelatin stab. Slight growth in depth ; surface growth violet ; liquefaction 



slow. 



Agar slant. Growth blue-black. 

 Potato. Growth violet. 

 Habitat. Water. 



154. B. amethystinus 



B. amethystinus-mobilis Germane: Centralblatt f. Bakteriol., XII, 1892, 516. 



Morphology. Bacilli slender, long, not in filaments. No growth at 37. 



Gelatin colonies. Membranaceous ; liquefied slowly, becoming violet. 



Bouillon. A rugose membrane. 



Agar slant. Growth scanty. 



Potato. Growth brownish. 



Milk. Coagulated. 



Habitat. Air. 



CLASS XIII. WITHOUT ENDOSPORES. AEROBIC AND FACULTATIVE 

 ANAEROBIC. CULTURES SHOW A GREENISH FLUORESCENCE. 

 GELATIN LIQUEFIED. 



I. Gelatin liquefied slowly. 



A. Growth' on potato greenish. 



155. B . Lesagei Tre visan . 



B. Growth on potato brownish, or becoming eventually so. 

 i . Grow well at 37. 



a. Very small slender rods (one-half the size of tubercle bacilli). 



156. B. smaragdinus Reimann. 



