THE CLASSIFICATION OF BACTERIA 247 



B. Gelatin liquefied slowly ; non-pathogenic. 



117. B. larvicida Dyar. 



118. B. dendriticus Lustig. 



115. B. murisepticus Karlinsky 



B. murisepticus-pUormorphus 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. vulgaris. 



Potato. Growth whitish gray, homogeneous, spreading. 



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



septicaemia. 

 Habitat. Isolated from pus. 



116. B. Wesenbergii 



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



Closely related to B. vulgaris. 



Morphology. Bacilli 0.5-0.8 : 1.2-2.0 ft ; 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 : 1.0 fx. Gelatin liquefied in 14-22 days. 

 Gelatin colonies. Proteus-like. 



