196 BACTERIOLOGY 



206. Bact. geniculatum (Duclaux) 



Tyrothrix geniculata Duclaux : Le Lait, Paris, 1887, 331. 



B. geniculatus Trevisan : Genera, 1889, 16. 



B.gonatoides Trevisan: Saccardo, Syllog. Fungorum, VIII, 1889, 964. 



Morphology. Bacilli, very thick rods — long interwoven filaments. 



Milk. Slowly coagulated ; leucin, tyrosin, acetic acid, and ammonia produced. 



Habitat. Milk and cheese. 



207. Bact. panis 



B. mesenteric-us-panis-viscosus J Orth: Zeitsch. f. Hygiene, XXVI, 1897, 404. 



Morphology. Bacilli plump, rounded, 3-5 /i long ; no flagella. Spores oval,, 

 placed in the middle of the rods. Stained by Gram's method. 



Gelatin colonies. Flat ; liquefaction crateriform, with a thick grayish white 

 nucleus, and a membrane on the surface. 



Gelatin stab. Liquefaction slow, becoming saccate. 



Agar colonies. Gray brown, granular, with delicate outgrowths. 



Agar slant. Growth bluish gray, translucent. 



Potato. Growth white, becoming gray, at first slimy, smooth, becoming silky 

 and rugose. 



Milk. Coagulated, peptonized. 



Glucose bouillon. No gas. 



Bouillon. Only a faint turbidity after many days. 



Lactose bouillon. No change of color. Optimum temperature 35°-37°. No' 

 anaerobic growth. Grow in acid media, rendering them slowly alka- 

 line. 



Habitat. Isolated from stringy bread dough. 



CLASS XIV. WITH ENDOSPORES. AEROBIC AND FACULTATIVE 

 ANAEROBIC. RODS NOT SWOLLEN AT SPORULATION. GELA- 

 TIN NOT LIQUEFIED. 



I. Colonies on gelatin papillate, small (about I mm.). 



208. Bact. Mansfieldii. 



II. Colonies on gelatin spreading. 



209. Bact. Schottelii (Trevisan). 



210. Bact. subtiliforme (Schroter). 



211. Bact. simile (Schroter). 



