384 BACTERIOLOGY. 



organic substances. There results a widespread oedema, 

 with more or less of gas production in the tissues. In 

 the oedematous fluid about the seat of inoculation the 

 organism under consideration may be detected. (Fig. 

 83, A.) 



Fig. 83. 



8< ly 



^\^ '^i 





Bacillus of mali^nanf oedema. 

 .4. Bacilli in short and long threads in oedematous fluid from site of inocu- 

 lation of guinea-pig. (After Koch.) 

 B. Spore stage of the organism ; from culture. 



It is a rod of about 3 to 3.5 /* long and from 1 to 

 1.1 p^ thick, i. e., it is about as long as the bacillus 

 anthracis but is a trifle more slender. It is usually 

 found in pairs, joined end to end, but may occur as 

 longer threads ; particularly is this the case in cultures. 

 When in pairs, the ends that approximate are squarely 

 cut, while the distal extremities are rounded. When 

 occurring singly, both ends are rounded. (How does it 

 differ in this respect from the bacillus anthracis f) It 

 is slowly motile and Us 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 tlie 

 body of the cell. These may cause a swelling of the 



