286 BACTERIOLOGY 



221. B. coccineus Pansini 



Virchow's Archiv, CXXII, 1890. 



Morphology. Bacilli large, slightly motile. 



Gelatin colonies. Ciliate. 



Gelatin stab. Liquefaction infundibuliform ; a thin, yellowish membrane, and 



a white sediment. 



Agar slant. Growth yellowish reddish. 

 Potato. Red points coalescing, with grayish folds between. 

 Bouillon. Slightly turbid, with a delicate membrane. 

 Habitat. Sputum. 



223. B. viscosus 



Roter Kartoffelbacillus Vogel : Zeitsch. f. Hygiene, XXVI, 1897, 404. 



Morphology. Bacilli slender ; ends rounded ; no chains. Small, glistening 



spores. Stain by Gram's method. 



Gelatin colonies. Flat, crateriform ; the dark nucleus shows spiny outgrowths. 

 Agar colonies. Gray brown ; a thick nucleus with delicate outgrowths. 

 Agar slant. Growth dry, gray white. 



Potato. Growth reddish yellow, becoming rose-red, rugose. 

 Milk. Coagulated. 



Bouillon. Clear, with a thick membrane. Optimum temperature 37. 

 Habitat. Isolated from stringy bread. 



224. B. vitalis 



B. mesentericus-ruber Globig: Zeitsch. f. Hygiene, III, 1888, 322. 



Morphology. Bacilli 0.4:1-4^ filaments. Stain by Gram's method. 



According to Globig, cultures withstand boiling for 5-6 hours. Spores? 

 Gelatin colonies. Vary in character from those of B. typhosus to those of 



B. subtilis. 

 Gelatin stab. Typhoid-like, later a shallow funnel of liquefied gelatin, with a 



membrane on the surface. 

 Bouillon. Clear, with a thick membrane. 

 Potato. Growth becomes red to reddish brown. 

 Milk. Not coagulated, slightly alkaline. 

 Glucose bouillon. No gas. H 2 S negative. 

 Pathogenesis . Non-pathogenic to mice and guinea pigs. 

 Habitat. Isolated from potato. 



