XI.] 



BACILLUS: PATHOGENIC FORMS. 



141 



and have small haemorrhagic spots. The spleen is invariably 

 enlarged and hsemorrhagic spots are often noticed on the 

 peritoneum of the abdominal organs, and there is some 

 peritoneal exudation. The blood of the spleen, of the 

 liver, lung, and intestine, the serous coating of the abdominal 

 organs, and the peritoneal exudation, contain the same 

 bacilli as the subcutaneous exudation. Many of them 



FIG. 76. BLOOD OF A GUINEA-PIG DEAD OF KOCH'S MALIGNANT OEDEMA. 



1. Red blood discs. 



2. White corpuscles. 



3. Single bacilli. 



4. Chain of long bacilli. 



5. Leptothrix. 



Magnifying power 700. (Stained with gentian violet.) 



include spores. By injecting the bacillus into the peritoneal 

 cavity of guinea-pigs death is produced rapidly, especially 

 after passing it through two generations, so rapidly indeed 

 that the animals often die within sixteen hours (Burdon 

 Sanderson and Klein). In all these instances a viscid 

 transparent slightly but spontaneously coagulable exudation, 

 poor in white and red corpuscles, is found in the peritoneal 



