THE BACILLUS OF MALIGNANT (EDEMA. 443 



FlG - 95 - 



When in pairs the ends that approximate are squarely 



cut, while the distal extremities are rounded. When 



occurring singly both ends are round- 



ed. (How does it differ in this respect 



from bacillus anthracis?} It is slowly 



motile, and its flagella are located 



both at the ends and along the sides 



of the rod. It forms spores that are 



usually located in or near the middle 



of the body of the cell. These may 



cause a swelling of the cell at the point 



at which they are located and give to 



it a more or less oval, spindle, or lozenge 



shape. (Fig. 94, B.) 



It is a strict anaerobe, growing on 

 all the ordinary media, but not under 

 the access of oxygen. It grows well 

 in a hydrogen atmosphere. It causes 

 liquefaction of gelatin. 



In tubes containing about 20 to 30 

 c.c. of gelatin that has been liquefied, 

 inoculated with a small amount of the 

 culture, and then rapidly solidified in 

 ice-water, growth appears in the form 

 of isolated colonies at or near the bot- 

 tom of the tube in from two to three 

 days at 20 C. These colonies, when Colonies of the ba ' 



J . cillus of malignant 



01 from 0.5 to 1 mm. in diameter, ap- oedema in deepgela- 



pear as little spheres filled with clear ^ cnitme. (After 



\ r FKANKEL and PFEIF- 



liquid, and are difficult, for this reason, FEE.) 

 to detect. (Fig. 95.) 



As they gradually increase in size the contents of the 

 spheres become cloudy and are marked by fine radiating 



