106 THE PATHOGENIC BACTERIA. 



man have reproduced the .disease in many instances. Pus 

 cultures of the gonococci have also given positive results in 

 many cases : Wertheim, 5 times in 5 cases ; Bockardt, 6 

 times in 10 cases ; Finger, 3 times in 14 cases. Subcutaneous 

 injections of the culture produce considerable tumefaction and 

 redness at the point of inoculation, but no abscess-formation. 



X. 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- 

 organisniSj and is considered an inoffensive saprophyte in 

 most cases. It may, however, under certain conditions 

 become pathogenic. 



Morphology. It is a delicate rod with rounded or pointed 

 ends. 



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. 



XI. Bacillus Pyogenes Fcetidus. 



This organism was first obtained by Passet from suppurat- 

 ing surfaces in the vicinity of the lower bowel. 



Morphology. It is a short bacillus with rounded ends, 

 usually found in pairs or in short chains. 



Biology. It is an aerobic, motile, and grows on all media. 

 Stains with all the anilin dyes. The cultures are noted on 

 account of the disagreeable putrefactive odor which they emit. 

 It derives its name from this feature. 



XII. Pneumococcus or Pneumobacillus. 



Friedlaender discovered this organism. It is sometimes 

 found : a. in pus associated with other organisms and b. in 

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



