PATHOGENIC BACTERIA. 263 



formed in Dunham's peptone solution. Blood-serum is 

 liquefied. 



The bacillus pyocyaneus seems to be rather widely dis- 

 tributed in nature; it has been found on the skin, in nor- 

 mal feces, also in diarrheal discharges and in dysentery. It 

 is the cause of the color in blue or green pus. It has fre- 



FIG. 65. 



M'/, 



' l/ ^x--- 



% , I V > 



\ * ' 

 C. * 'I 



* * / I 



.. \*t ' 





Bacillus pyocyaneus, pure culture. (X 1000.) 



quently been demonstrated in pus, but oftenest perhaps, in 

 mixed infections. It has been found in various abscesses, in 

 otitis media, peritonitis, appendicitis and broncho-pneu- 

 monia. It has been known to produce general septicemia. 1 

 It is pathogenic for guinea-pigs and rabbits, in whom it may 

 produce septicemia. In animals it may lead only to local 

 suppuration, from which they may recover, being made im- 



1 Lartigau, Philadelphia Medical Journal, September 17, 1898; Journal 

 Experimental Medicine, Vol. III., 1898; Perkins, Journal Medical Re- 

 search, Vol. VI., 1901. 



