2 32 SA CTERIOLOG Y. 



soft parts ; in purulent infiltration of the tissues about 

 a fracture ; in purulent cerebro-spinal meningitis ; in 

 suppurative synovitis ; in acute pericarditis, and in acute 

 inflammation of the middle ear. 



Moreover, many of the less common organisms have 

 been detected in pure cultures in inflammatory con- 

 ditions with which they were not previously thought to 

 be concerned, and to which they are not usually related 

 etiologically. 



In consideration of such evidence as this, it is plain 

 that we can no longer adhere rigidly to the opinions 

 formerly held upon the etiology of suppuration, but 

 must subject them to modifications in conformity with 

 this newer evidence.' We now know that there exist 

 bacteria other than the " pyogenic cocci," which, though 

 not normally pyogenic, may give rise to tissue changes 

 indistinguishable from those produced by the ordinary 

 pus organisms.* 



THE BACILLUS PYOCYANUS (BACILLUS OF GEEEN PUS). 



Another common organism that may properly be 

 mentioned at this place, though perhaps not strictly 

 pyogenic, is a bacillus frequently found in discharges 

 from wounds, viz., the bacillus pyocyanus, or bacillus of 

 green pus, or of blue pus, or of blue-green pus, as it 

 is commonly called. The bacillus pyocyanus is a 

 delicate rod with rounded or pointed ends. It is 

 actively motile ; does not form spores. As seen in 

 preparations made from cultures it is commonly clus- 



' Fora more detailed discussion of the subject, see " The Factors Concerned 

 in the Production of Suppuration," International Med. Mag., Fhila., May, 

 1892. 



