XV] ANAEROBIC BACILLI 377 



proceed gradually and slowly, till all the gelatine is lique- 

 fied ; at the bottom of this is a voluminous greyish-white 

 filamentous mass. It grows best in gelatine to which 1-2 

 per cent, of grape sugar has been added. In solidified 

 sugar Agar it grows well, producing uniform turbidity all 

 through the medium, with floccular condensations and 



Fig. 153. — Stag Culture of Sugar Gelati.xe with the Bacillus of Malignant 

 CEdema ; NUMEROUS Gas Bubbles are shown abo\e .and in the Liquefied 

 Growth. 



Natural size. 



numerous gas bubbles. Solidified blood-serum is liquefied 

 by the bacillus. The cultures act virulently on animals, 

 provided comparatively large quantities are injected. 



Oval bright spores are formed in the short bacilli, either 

 in the middle or at one en.d ; the spores are thicker than 

 the bacilli themselves ; and some of the bacilli in the 



