THE CLASSIFICATION OF BACTERIA 79 



14. M. zanthogenicus (Freire) Sternberg 



Oyptococcus xanthogenicus Freire. 



Micrococcus of Freire Sternberg : Manual of Bacteriology, 1892. 



Morphology. Cocci 0.5-0.8 /i, ; occur singly, in twos and in groups. Stain by 

 Gram's method. 



Gelatin stab. A crateriform liquefaction, becoming stratiform, with a milk- 

 white sediment. 



Agar stab. In depth growth white-opaque; on the surface soft, milk-white. 



Potato. Growth milk-white, limited. 



Pathogenesis. Guinea pigs, negative. According to Freire the organism is 

 pathogenic in summer, and for small birds. 



Habitat. Isolated from cases of yellow fever and supposed by Freire to be 

 the cause of the disease. 



15. M. Freudenreichii Guillebeau 



Schweizer Archiv. f. Thierheilkunde, XXXIV, 1892, 128. 



Morphology. Cocci large, 2.0 /n and more ; occur singly, rarely in chains. 



Gelatin colonies. White, entire, granular ; liquefied in 2 days. 



Agar slant. Growth white. 



Potato. Growth yellowish — yellowish brown. 



Bouillon. Turbid, becoming clear, with a flocculent sediment. 



Milk. Coagulated, viscid, acid. 



Habitat. Milk and cheese. 



16. M. radiatus Flugge 



Die Mikroorganismen, 1886. 



Morphology. Cocci small, 0.8-1.0 /ii; occur singly, in short chains and 



clumps. 

 Gelatin colonies. Large white ; in 2 days slightly liquefied, with a yellowish 



green fluorescence. Microscopically brownish yellow, granular; border 



fimbriate — ciliate. Colonies become 10-15 mm. in diameter, and show 



a concentrically zoned structure. 

 Gelatin stab. Growth along line of stab arborescent, becoming an ipfundi- 



buliform liquefaction. 

 Potato. Growth yellowish brown. 

 Habitat. Air and water. 



