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 ; wrinlcled. 

 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, i8go, 372. 



Morphology. Cocci large, round, i.o /*; in twos, threes, and short chains. 

 Gelatin colonies. Surface: 6 days, round, i.o 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. 



