THE CLASSIFICATION OF BACTERIA 8l 



20. M. aerogenes Miller 



Deutsche medizinische Wochenschrift, 1883, No. 3. 



Morphology. Cocci large, oval. 



Gelatine colonies. Round, smooth. 



Gelatin stab. In depth a brownish yellow line ; on the surface a flat grayish 



white button ; a slight liquefaction after some days. 

 Agar slant. Growth yellowish white. 

 Potato. Growth yellowish white. 

 Habitat. Found in the alimentary canal. 



21. M. foetidus Klamman 



Allg. med. Centralzeitung, 1887, 344. 



Morphology. Cocci of irregular sizes ; occur singly, in pairs, short chains, and 

 irregular groups. Single diplococci 1.4 /tx. At 37 C. only slight growth. 



Gelatin colonies. White, round-oval. 



Gelatin stab. Growth milk-white, glistening, with an elevated knobby surface, 

 becoming concentric and brownish. Liquefaction occurs slowly. Cul- 

 tures have a disagreeable odor of ozaena. 



Agar slant. Growth irregular, white, spreading. 



Potato. Growth irregular, slimy, pale reddish gray, with a knobby surface. 

 Odor of ozaena. 



Habitat. Isolated from the posterior nares of man. 



22. M. alvi 



M. albus liquefaciens Sternberg : Manual of Bacteriology, 1892. 



Morphology. Cocci 0.8-1.2, often oval, and 3.0 ju, long; in irregular groups. 

 Considerably larger than M. pyogenes. 



Gelatin colonies. Round, white ; after some time a liquefaction of the surround- 

 ing gelatin takes place. 



Gelatin stab. In depth a feeble growth, later a funnel of liquefaction, with a 

 scum on the liquefied gelatin. 



Agar slant and blood serum. Growth white ; latter not liquefied. 



Potato. Growth very scanty, thin, colorless, becoming a collection of white 

 button-like masses. 



Habitat. Isolated from alvine discharges of healthy infants. 



