.I04 BACTERIOLOGY 



78. M. cereus Passet 



M, cereus-flavus Passet: Fortschritte d. Medezin, III, 1887. 

 Tils : Zeitsch. f. Hygiene, IX, i8go, 300. 



-Morphology. Cocci of variable sizes ; in clumps and occasionally in chains. 

 Gelatin colonies. Lemon-yellow, becoming 1-2 mm. 



Gelatin stab. In depth, growth scanty, yellow ; on the surface, the growth re- 

 sembles drops of stearine or wax, yellow, with elevated margins. 

 Potato. Growth citron-yellow. 

 Habitat. Isolated from a human abscess. 



79. M. orbiculatus Wright 



L.c, p. 432. 



Morphology. Cocci rather large, in pairs, tetrads, and small clumps. Grow 



at 36" C. 

 Gelatin colonies. Deep : round, entire, opaque, yellowish. Surface : in j days 



rounded, slightly elevated, white, glistening, i mm., becoming 2-3 mm.; 



dark yellow, pale margins. Microscopically, brownish yellow — brown, 



dense, granular. 

 Gelatin slant. Growth brownish yellow, glistening, limited, rather thick. 

 Agar slant. Growth slight, composed of discrete and confluent colonies ; 



grayish-yellowish . 

 Bouillon. Alkaline, with a yellowish stringy sediment. 

 Potato. Growth yellow, glistening, thick, spreading. 

 Litmus milk. Not coagulated ; after several weeks slightly pink. 

 Pepton-rosolic acid solution. Slowly decolorized, alkaline. Indol, negative. 

 Habitat. Water. 



80. M. aerius 



M. No. 4g Conn : l.c. 1894, 81. 



Morphology. Cocci i.o. Slight growth at 35° C. 



Gelatin colonies. Not characteristic. 



Gelatin stab. In depth, slight growth ; on the surface, a slight orange growth. 



Agar slant. Growth thick, dark orange, quite transparent. 



Potato. Growth invisible. 



Milk. Unchanged. 



Bouillon. Turbid, becoming in 4 weeks clear. 



Habitat. Milk. 



