BACTERIAC.E: THE SPOROGENIC AEROBES 



271 



The cell is about 1.25^ wide and 3 to io, long, with rounded 

 ends when single, but in the threads the contiguous ends are 



.;% . * V*** /*- 



" ' ' 





FIG. 109. Bact. anthracis. Spore production. (From Marshall after Migula.} 



square-cut. In the circulating blood the bacilli are single or in 

 pairs and spores are never formed in the animal body (Fig. 108). 

 In cultures long threads are produced and spores are usually 



FIG. no. Bact. anthracis. Colony upon a gelatin plate. Xioo. (After Fraenkel 



and Pfei/er.) 



formed after 24 to 48 hours (Fig. 109). The anthrax bacillus 

 is aerobic and grows readily on all ordinary media, best at 37 C. 



