116 THE PATHOGENIC BACTERIA. 



VIII. Bacillus Pyocyaneus. 



The Bacillus pyocyaneus is found frequently in suppurating 

 wounds, especially in burns. It colors the pus green and the 

 dressings a bluish-green, without showing any color-influence 

 on the local condition of the wound. 



Pathogenesis. It exists in pus associated with other micro- 

 organisms, and is considered an inoffensive saprophyte in 

 most cases. It may, however, under certain conditions, be- 

 come pathogenic. 



Morphology. It is a delicate rod with rounded or pointed 

 ends, actively motile and flagellated at one end. 



Biologic Characters. It is aerobic and grows readily on all 

 artificial media, and imparts to them a bright green color. It 

 liquefies gelatin and stains readily with all anilin dyes. 



IX. Pneumococcus or Pneumobacillus. 



Friedlaender discovered this organism. It is sometimes 

 found: a, in pus associated with other organisms, and />, in 

 cases of pneumonia as the sole factor of the disease and its 

 secondary abscesses. The pus produced by it is thick and 

 creamy white in color. 



Pathogenesis. It frequently causes suppuration in the ser- 

 ous membranes pleura, peritoneum, pericardium, and lungs. 

 It has also on some occasions caused suppuration in the vis- 

 cera and in the subcutaneous and deep cellular tissue. 



X. Bacillus Coli Communis. 



XI. Bacillus Typhosus. 

 XII. Bacillus Tuberculosis. 



These three organisms are sometimes found associated with 

 pus-formation, and have been thought to be occasionally the 

 chief suppurative agents. The discussion of this subject, 

 however, will be properly taken up under the head of the 

 description of these bacilli. 



