290 BACTERIOLOGY 



Gelatin stab. Good growth in depth ; on the surface, an irregular growth, 



2 mm. 



Agar slant. Growth thin, glistening, becomes a faint yellow. 

 Potato. In 3 days, a thin yellow moist glistening growth. 

 Bouillon. Turbid, becoming clear, the medium a faint greenish. 

 Pepton rosolic acid solution. In 3-4 days, slightly darker. 

 Litmus milk. Darker, becoming decolorized, not coagulated, alkaline. 

 Glucose bouillon. No gas. Indol negative. Grow at 36. 

 Habitat. Soil. 



233. B. catenula (Duclaux) 



Tyrothrix catenula Duclaux : Le Lait, Paris, 1887, 249. 



Morphology. Bacilli 0.6-1.0 /x, thick, in filaments. 



Milk. Coagulated, gas produced, peptonized ; production of leucin, tyrosin, 



butyric acid, and ammonia. 

 Habitat. Cheese. 



234. B. urocephalus (Duclaux) 



Tyrothrix urocephalus Duclaux : I.e. 



Morphology. Bacilli thick, filaments. 



Milk. Coagulated at body temperature, at ordinary temperatures scarcely 



altered ; on the surface, a gelatinous mass ; production of acid, leucin, 



and tyrosin. 

 Habitat. Cheese. 



235. B. filiformis (Duclaux) 



Tyrothrix filiformis Duclaux : l.c; 



Morphology. Bacilli in milk 0.8 /A thick, filaments. 

 Milk. In 2-3 days, unaltered, becoming peptonized to a turbid fluid ; on the 



surface, a crumpled membrane ; production of leucin and tyrosin. 

 Habitat. Cheese. 



CLASS XIX. WITH ENDOSPORES. AEROBIC AND FACULTATIVE AN- 

 AEROBIC. RODS SWOLLEN AT ONE END AT SPORULATION, OF 

 THE TETANUS TYPE 



I. Gelatin liquefied, at least in gelatin stab cultures. 



A. Grow rapidly in nutrient gelatin. 



236. B. sublanat^ls Wright. 



B. Grow very poorly in nutrient gelatin. 



237. B. lacteus. 

 II. Gelatin not liquefied. 



238. B. putrifictis Flugge. 



