298 



ANTHRAX. 



parallel with one another, each filament consisting of a 



chain of bacilli lying 

 end to end, and similar 

 to those observed in 

 the blood (Fig. 79). 



On gelatine plates, 

 after from twenty-four 

 to thirty -six hours at 

 20 C., the same ap- 

 pearances manifest 

 themselves, and later 

 they are accompanied 

 by liquefaction of the 

 gelatine. In gelatine 

 plates, however, instead 

 FIG. 7 8. Surface colony of the anthrax of the characteristically 



bacillus on an agar plate, showing the wreathed appearance at 



characteristic appearances. x -?o. .1 .1 , 



the margin, the colonies 

 sometimes give off 

 radiating spikelets ir- 

 regularly nodulated, 

 which produce a star- 

 like form. These 

 spikelets are com- 

 posed of spirally 

 twisted threads. 



From such plates 

 the bacilli can be 

 easily isolated, and 

 the appearances of 

 pure cultures on 

 various media 

 studied. 



Appearances of FIG. 79. Anthrax bacilli, arranged in chains, 

 Cultures. In boilil- ^ rom a twent y-f ur hours' culture on agar at 



Ion, after twenty-four 37 St ai ne ci with fuchsin. x 1000. 



hours' incubation at 



37 C. there is usually the appearance of irregularly spiral 



