164 
PRINCIPLES OF BACTERIOLOGY 
vaccines are grown at 42° to 43° C., so that no spore¬ 
forming bacteria are produced). 
Bacillus Aerogenes Capsulatus 
Bacillus aerogenes capsulatus was discovered by Welch 
of Johns Hopkins University, in 1892. 
The organism is 3 to 6 [x long, usually occurs single, 
has spores, is nonmotile, has no flagella, has a capsule, is 
Gram-positive. 
Fig. 31.—The anthrax bacilli showing spores. (Mallory and Wright— Patho¬ 
logical Technic .) 
This bacillus is a strict anaerobe and grows on all 
simple media. Gelatin is slowly liquefied. Grape sugar, 
milk and cane sugar are all fermented. 
The infection usually occurs after injury, especially 
after open fractures. In the present war this infection 
has been of great importance, and it seems that gunshot 
wounds offer great opportunity for such infections, es- 
