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 //.. 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 



D. amethystinus-mobilis Germano : 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 Trevisan. 



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

 1 . Grow well at 37 . 



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



156. B. smaragdinus Reimann. 



