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: I.e. 

 Morphology. Bacilli in milk 0.8 fi 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. sublanatus Wright. 



B. Grow very poorly in nutrient gelatin. 



237. B. lacteus. 

 II. Gelatin not liquefied. 



238. B. putrificus Flligge. 



