THE CLASSIFICATION OF BACTERIA 103 



75. M. varians (Dyar) 



MeHsmopedia fiava-varians Dyar, l.c, p. 346. 



Morphology. Cocci i.o /*, in twos and tetrads. 



Gelatin colonies. Deep : round-irregular, opaque, yellow. Surface : opaque, 



dull, light yellow ; edge slightly wavy. 

 Lactose litmus. Reddened. 

 Milk. Coagulated only on boiling. 

 Bouillon. Turbid ; yellow sediment. 

 Glucose agar. Growth bright yellow, opaque. 

 Potato. As before. 

 Nitrates. Reduced. 

 Habitat. Air. 



76. M, Vincenzii 



M. tetragenus-citreus Vincenzi : La Riforma Med., 1897,758, 



Morphology. Cocci in tetrads. Do not stain by Gram's method. Facultative 



anaerobic. Grow at 37° C. 

 Gelatin colonies round, yellowish ; gelatin liquefied in 6-12 days. 

 Gelatin stab. In depth, a beaded growth ; on surface, gelatin softened, not 



fluid. 

 Agar slant. Growth yellowish. 

 Bouillon. A citron-yellow sediment. 

 Milk. Not coagulated ; a citron-yellow sediment. 

 Pathogenesis. Rabbits, guinea pigs, and mice, negative. 

 Habitat. Isolated from the submaxillary lymphatic gland of a child. 



77. M. aurantiacus (Schroter) Cohn 



Bacteridium aurantiacus Schroter : Beitr. -l. Biol., I, 1870, 119. 

 M. aurantiacus Cohn ; Beitrage, 1, 1870, 154. 



Morphology. Cocci round — slightly oval, i .3-1.5 \>- \ occur singly, in twos and 

 small clumps. 



Gelatin colonies. Surface: round-oval, smooth, glistening, with orange-yellow 

 centres. Microscopically, finely granular. 



Gelatin stab. In depth, small yellow colonies ; on the surface, a similar de- 

 velopment. 



Agar slant. Growth orange-yellow, spreading. 



Potato. Growth slimy, yellow ; pigment insoluble in alcohol and ether. 



Habitat. Isolated from the air and from water. 



