COMPLICATIONS 27 



larged, dark, and somewhat pulpy spleens ob- 

 served in individual hogs dead in outbreaks of 

 cholera. It also seems to intensify hemorrhagic 

 lesions produced by the filterable virus. Its 

 pathogenic powers in relation to cholera immune 

 pigs will bear further investigation, but it is prob- 

 able that for the most part it acts to complicate 

 diseases produced by other causes. 



B. pyocyaneus, or, according to Migula's classi- 

 fication, Pseudomonas pyocyaneus, is a motile rod 

 2 to 6 microns long and .3 to 1 micron broad. It is 

 widely distributed in nature, and there has been a 

 tendency to regard it chiefly as a saprophyte. It 

 is included frequently in the flora of wounds, it 

 appears at times in abscesses in swine and other 

 animals, and it has been described as the cause of 

 an outbreak of dysentery in man. In Germany it 

 is said to be the cause of an infectious nasal 

 catarrh in pigs, and we have found it associated 

 with outbreaks of pneumonia in swine, as the prob- 

 able cause. 



The organism is an aerobe, it grows luxuriantly 

 on the common culture media, tending to over- 

 whelm other bacteria associated with it. It has a 

 marked tendency to produce green color in any cul- 

 ture medium, and the sweetish odor produced by 

 it in bouillon cultures is quite characteristic. It 

 takes the aniline stains regularly, and is Gram 

 negative. 



