290 BACTERIA IN INFECTIOUS DISEASES. 



tion with active virus, but the other resisted such 

 inoculation. 



This corresponds very closely with the thermal 

 death-point of the micrococcus of septicaemia in 

 the rabbit, and the micrococcus of pus, as deter- 

 mined by the writer, and is strong evidence in 

 support of the view that the virulence of the fluid 

 containing it depends upon the vitality of the 

 micro-organism. The resistance to various chemi- 

 cal reagents, as determined by Salmon, also cor- 

 responds very closely with results obtained by the 

 writer in similar experiments with the micrococ- 

 cus of induced septicaemia in the rabbit. These 

 two species of Micrococcus, however, have distinct 

 physiological properties, as the writer has proved 

 the innocuousness of the oval micrococcus of septi- 

 caemia in the rabbit when injected into the muscles 

 of fowls. Pasteur finds no difference, morphologi- 

 cally, between the organism which produces the 

 " new disease" described by him (see p. 365), and 

 that which produces cholera des ponies. He also 

 found that this micrococcus of induced septicaemia 

 in the rabbit does not produce the slightest ill- 

 effect when injected into fowls. Toussaint has 

 claimed that fowl-cholera and acute septicaemia in 

 animals, produced by the injection of the blood of 

 animals dead with cholera, or of animal matters 

 more or less putrid, are identical diseases and due 

 to the same parasite. He says : " Since the ex- 

 periments of Coze and Feltz in 1866, of Davaine, 

 Vulpian, Bouley, etc., and the labors of the Ger- 



