BACILLUS MALLEI AND MISCELLANEOUS BACILLI 359 



Bacillus Pyocyaneus (Pseudomonas Pyocyanea). — Gessard 

 in 1882 isolated this organism from green pus. It is a slender 

 rod, actively motile. A soluble blue-green pigment is produced 

 in the cultures. Gelatin is liquefied. Guinea-pigs are susceptible 

 to intraperitoneal inoculation. In man the organism is most 

 common in the pus from wounds, where its presence is considered 

 as only mildy deleterious. The bacillus has also been found in 

 otitis media and a few cases of fatal generalized infection with B. 

 pyocyaneus have been described. 



Bacillus Fluorescens var. Putidus.^This non-pathogenic 

 actively motile rod is common in putrefying material. It pro- 

 duces spores when grown on quince jelly. The greenish-yellow 

 pigment is soluble in water. Gelatin is not liquefied. A number 

 of different fluorescing bacilli have been found in. the soil and 

 surface waters. Some of them liquefy gelatin. 



Bacillus Violaceus. — This is a non-pathogenic water bacterium 

 which produces a pigment of deep violet color. It is actively 

 motile and hquefies gelatin rapidly. The pigment is not soluble 

 in water. Several different bacteria are known which produce 

 a violet pigment. 



BaciU^s Cyanogenus (Pseudomonas Syncyanea). — This non- 

 pathogenic actively motile organism produces a bluish-black 

 -pigment which is soluble in water. Gelatin is not liquefied. 

 B. cyanogenus sometimes causes trouble in dairies as its growth 

 in milk imparts a blue color to it. 



Bacillus Prodigiosus.^This small oval organism grows rapidly 

 at room temperature on ordinary media 1 and is occasionally 

 observed on foodstuffs such as moist bread and potatoes. Ordi- 

 narily it is encapsulated and non-motile, but it sometimes possesses 

 flagella. Gelatin is rapidly liquefied. A red pigment is produced 

 at room temperature but not at 37° C. This pigment is insoluble 

 in water. Large doses of B. prodigiosus injected into animals 

 sometimes give rise to signs of intoxication. 



