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 JJL 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. 



Potato. 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. 



