i 5 8 



MICRO-ORGANISMS AND DISEASE. [CHAP. 



Blood-bacilli exposed to a temperature of 55 C. or to a 

 solution of ^ to i per cent, of carbolic acid, lose their viru- 

 lence (Toussaint). Chauveau found that exposure to a tem- 

 perature of 52 C. for fifteen minutes, or of 50 C. for twenty 



FIG. 86. NETWORK OF CAPILLARIES FILLED WITH BACILLUS ANTHRACIS ; FROM 

 THE OMENTUM OF A RABBIT DEAD OF ANTHRAX. 



1. Extravasation of the ba:illi. 



2. Capillaries filled with the bacilli. 



Magnifying power 350. 



minutes, destroys the virulence of the blood-bacilli. Pasteur 3 

 ascertained that by cultivating blood -bacilli in chicken-broth 

 at 42 to 43 C. they lose their virulence after twenty days' 



1 Cumptes Rendus, 1881 ; Transactions of the International Medical 

 Congrtss in London, 1881, vol. i. 



