CLASSIFICATION OF THE BACTERIA. 85 



with globular articles, short ; diameter 1 /x, united in 

 chains of 50 fi. 



Decomposes racemic acid, causing the right 

 tartaric acid to disappear, and setting free left 

 tartaric acid. 



MlCROBACTEEIA ChROMOGENES. 



B. xanthinum, Schrceter ( Vibrio synxanthus, Ehrb.). 



" Bodies cylindrical, slightly flexible, formed of cor- 

 puscles rarely exceeding five in number ; length of 

 an article, 0.7 to 1 p. In tainted cow's milk, to which 

 it gives a yellow color." 



B. syncyanum, Schrceter ( Vibrio syncyanus, Ehrb.). 

 This Bacterium, which has the same charac- 

 ters as the preceding, has been observed in sour 

 milk, to which it gives a blue color. 



B. oeruginosum, Schrceter. 



In greenish blue pus. 



These B. chromogenes resemble entirely the 

 lactic vibrios, B. termo or catenula. According 

 to Robin, colored milk contains colorless vibrios, 

 and the coloration is due to an alga similar to 

 Leptomitus. 



B. brunneum, Schrceter. 



Rods in a brown coloring matter in infusions 

 of rotten corn. 



Following the colored Microbacteria, I place 

 two species of Bacterium recently described by 

 Ray-Lankester and Warming. 



B. rubescens, Ray-Lank., 1873. 



Under this name Ray-Lankester has described 



