THE CLASSIFICATION OF BACTERIA 247- 



B. Gelatin liquefied slowly ; non-pathogenic. 



117. B. larvicida Dyar. 



1 1 8. B. dendriticus Lustig. 



115. B. murisepticus Karlinsky 



B. murisepticus-pleormorphus Karlinsky : Centralblatt f. Bakteriol., V, 1889, 193. 

 Morphology. Bacilli variable, coccoid-oval forms spiraloid proteus forms. 

 Gelatin colonies. Like B. vulgaris and mirabilis. 

 Agar colonies. Like B. vulgar is. 



Potato. Growth whitish gray, homogeneous, spreading. 

 Pathogenesis . Subcutaneous inoculations of mice cause death in 24 hours, of 



septicaemia. 

 Habitat. Isolated from pus. 



1 1 6. B. Wesenbergii 



B. der Fleischvergiftung Wesenberg : Zeitsch. f. Hygiene, XXVIII, 1898, 484. 



Closely related to B. vulgaris. 



Morphology. Bacilli 0.5-0.8 : 1.2-2.0 /x ; in twos and, in old bouillon cultures, 



in chains. No involution forms. Not stained by Gram's method. 



Flagella peritrichic, mostly 8-12, rarely 20. Grow at 37. Spores not 



observed. 

 Gelatin colonies. In 3 days, liquefied, with a central yellowish colony, from 



which outgrowths proceed ; in 4 days, the whole plate is liquefied. 

 Gelatin stab. A good growth in depth ; on the surface, liquefaction begins 



under the growth and extends downward. 

 Agar colonies. In 36-48 hours, at 37, nearly the entire surface of the plate is. 



covered with a moist, glistening, slimy layer, with often a brownish 



shimmer. 



Bouillon. In 24 hours, turbid and alkaline, with a scum. 

 Milk. Coagulated, peptonized, alkaline. 

 Potato. Growth grayish white, slimy. 



Glucose bouillon. Gas and acid production. Indol not produced. Cultures- 

 have a foul odor. 



Pathogenesis. Subcutaneous inoculations of mice cause death. 

 Habitat. Isolated from poisonous meat in meat poisoning. 



117. B. larvicida 



Dyar: I.e. 



Morphology. Bacilli 0.8 : i.o /n. Gelatin liquefied in 14-22 days. 

 Gelatin colonies. Proteus-like. 



