236 BACTERIOLOGY. 



an immunity. The disease was produced by inocu- 

 lating rabbits with contaminated water (River 

 Panke) and with putrid meat infusion. 



Bacterium of Davaine's septicaemia. Rods 

 similar to the bacteria described by Koch. They 

 were also found in the blood of rabbits suffering 

 from septicaemia, which, however, differed from 

 Koch's septicaemia in that guinea-pigs were sus- 

 ceptible, and pigeons immune. 



Bacterium septicum sputigenum (Microbe de 

 salive, Pasteur. Micrococcus Pasteuri, Sternberg.^ 

 Bacillus septicus sputigenus, Frankel). Cocci oval, 

 singly, in pairs, and in chains ; often lanceolate or 

 rod-shaped; encapsuled. They grow well in broth, 

 and on agar-agar at 30 to 35 C. On the solid 

 media they form a superficial, nearly transparent 

 deposit of gelatinous consistence. They are 

 pathogenic in rabbits, producing typical "sputum 

 septicaemia." Fowls and dogs have an immunity, 

 and guinea-pigs are less susceptible than rabbits. 

 Mice die within forty-eight hours after being inocu- 

 lated. The blood of an infected rabbit just dead 

 is more potent than a liquid culture or than saliva 

 containing the coccus. An animal which recovers 

 after an injection of saliva is stated to be protected 

 from the potent virus. The pathogenic power is 

 modified by cultivation at a temperature between 

 39*5 and 40*5. The organism has been supposed 



* Sternberg, Stud. Biol. Lab., John Hopkins, Univ. 11, No. 2, 

 1882. Journal Royal Microscop. Society. 1886. 



