THE CLASSIFICATION OF BACTERIA 87 



Gelatin stab. On surface growth thin bluish gray, concentric. 

 Agar slant. Growth thin, spreading, bluish gray whitish. 

 Potato. Growth thin, yellowish gray, slimy. 

 Habitat. Water. 



34. M. cumulatus v. Besser 



M. cumulatus-tenuis v. Besser: Beitrage Path. Anat., VI, 347. 



Morphology. Cocci large, oval ; in masses. 



Gelatin stab. In depth growth white, beaded ; on the surface elevated slightly,. 



or flat, transparent. 

 Agar colonies. Surface; elevated, punctiform, 0.2 mm., becoming 5 mm., 



flat and transparent; microscopically, shows a brownish nucleus with a 



grayish brown border ; wrinkled. 

 Potato. Only a scanty growth. 

 Bouillon. Remains clear, with a sediment. 

 Habitat. Common in nasal mucus in man. 



35. M. salivarius Biondi 



M. salivarius-septicus Biondi: Zeitsch. f. Hygiene, II, 1887, 194. 



Morphology . Cocci round slightly oval. Stain by Gram's method. 



Gelatin colonies. Surface : round, grayish white, which may become darker. 



Gelatin stab. In depth beaded, white. 



Potato. Growth scanty. 



Pathogenesis. Inoculations of mice, guinea pigs, and rabbits cause death in 



4-6 days. Cocci in organs. No inflammatory reactions in tissues. 

 Habitat. Saliva of man. 



36. M. beta Foutin 



Coccus B Foutin : Centralblatt f. Bakteriologie, VI," 1890, 372. 



Morphology. Cocci large, round, 1.0 /1; in twos, threes, and short chains. 

 Gelatin colonies. Surface: 6 days, round, 1.0 mm., white, slightly raised; 



microscopically, gray yellowish gray, slightly granular towards periphery, 



smooth, and sometimes lobular. 

 Gelatin stab. The growth in depth shows lateral extensions; surface colony 



flat. 

 Agar slant. Growth white, smooth, glistening, rimmed. 

 Potato. A thin, scanty, almost transparent, whitish growth. 

 Pathogenesis. White rats inoculated intraperitoneally died in 5-6 days ; cocci 



in blood, liver, and spleen. 

 Habitat. Isolated from hail. 



