BACILLUS OF ANTHRAX 



I0 7 



requires plenty of oxygen, but may be classed as a facultative 

 anaerobe; grows well in all media. 



Colonies develop in two days; white shiny spots, which 

 appear under microscope as slightly yellowish, granular, 

 twisted balls, like a ball of yarn ; each separate string or hair, if 

 looked at under high power, being composed of bacteria in 

 threads. (See Fig. 44.) 



Fig. 45- Fig. 46. 



Figs. 45, 46. Stab-cultures of anthrax in gelatin. 



Agar Stroke. Grayish- white, slightly wrinkled layer with 

 irregular edges. 



Gelatin Stab-cultures. A white growth with thorn-like 

 processes along the needle-track (like an " inverted fir tree"). 

 Later on, gelatin liquefied, and flaky masses at the bottom. 

 (See Figs. 45, 46.) 



