THE CLASSIFICATION OF BACTERIA 229 



Pathogenesis. Subcutaneous inoculations of mice cause death by septicaemia. 



Guinea pigs but slightly affected ; rabbits negative ( ?). 

 Habitat. Isolated from the contents of the gall bladder and from faeces, and 



from yellow fever cadavers by Sternberg. 



67. B. exanthematicus Kruse 



B. der Typhus exanthematique Babes-Oprescu : Ann. Pasteur Inst, 1891, 273. 

 B. exanthematicus Kruse : Fliigge, Die Mikroorganismen, 1896, 426. 



Morphology. Bacilli 0.3-0.5 /x. thick, often very short, and in 8-shaped forms. 



Gelatin colonies. The deep colonies are round and yellowish brown; the 

 surface whitish, translucent, spreading, irregular. 



Agar slant. Growth glistening, gray, translucent. 



Potato. Growth gray-brown, translucent. 



Bouillon. Turbid, with a sediment and a membrane. 



Pathogenesis. Pathogenic to mice, guinea pigs, rabbits, and pigeons ; death 

 in 2-4 days ; local inflammation, enlargement of the spleen, and a brown- 

 ish color of the organs ; bacilli present. 



Habitat. Isolated from a case of hemorrhagic infection in man. 



68. B. accidentalis Kruse 



Eine neue pathogene Bakteriumart im Tetanusmaterial Belfanti-Pescarolo : Cen- 



tralblatt f. Bakteriologie, IV, 1888, 513. 

 B. accidentalis-tetani Kruse : Fliigge, Die Mikroorganismen, 1896. 



Morphology. Bacilli small, short, with polar stain. 



Gelatin stab. In depth, growth beaded ;. surface growth thin, iridescent. 



Pdtato. Growth yellowish, glistening. 



Pathogenesis. Pathogenic to mice, guinea pigs, and rabbits. Death in a few 

 days ; bacilli in the blood ; spleen swollen ; often paralysis, with convul- 

 sions. 



Habitat. Isolated from the wound pus of a person dead of tetanus. 



69. B. endocarditis Weichselbaum 



B. endocarditis-griseus Weichselbaum : Ziegler's Beitrage, IV, 119. 



Morphology. Bacilli typhoid-like in size ; diphtheria-like in form. 



Gelatin colonies. Aerogenes-like ; like Friedlander's bacillus, but of a grayer 



color. 

 Potato. Growth dry, greenish yellow yellowish brown. 



