THE CLASSIFICATION OF BACTERIA 89 



Agar slant. . Growth moist, grayish white, iridescent, with smooth border. 

 Potato. A scanty, scarcely visible growth. Optimum temperature 25 C. In 



hop beerwort a good growth, with a pellicle, and production of lactic acid. 

 Habitat. In beer, air of breweries, water. A common cause of turbidity in 



beer. 



41. M. fervidosus Adametz 



Bak. Nutz u. Trinkwasser, 1888. 



Morphology . Cocci 0.6 /x, diplococci, and in clumps. 



Gelatin colonies. Deep: entire, light yellow, strongly refracting. Surface: 

 5-6 days, transparent, yellow, serrate-lobate ; later colonies show a 

 brownish granular centre, and a yellowish, slightly folded border. 



Gelatin stab. In depth a beaded growth ; on surface growth round, thin, and 

 finely serrate. - 



Glycerin gelatin stab. Bubbles of gas. 



Agar slant. Growth milk-white, slimy, iridescent. 



Potato. Growth dirty white. 



Habitat. Water. 



42. M. rosettaceus Zimmerman 



Bak. Nutz u. Trinkwasser, Chemnitz, 1899. 



Morphology. Cocci round-elliptical, 0.7-1.0 fi; in clumps, like a bunch of 



grapes. 

 Gelatin colonies. Deep: round, entire. Surface: grayish yellow, glistening, 



drop-like expansions, with irregular contours. 

 Gelatin stab. In depth but slight growth ; on surface colony round, spreading, 



with rosette-shaped expansions. 

 Agar slant. Growth smooth, gray, glistening, spreading. 

 Potato. Growth yellowish gray. 

 Habitat. Water. 



43. M. ovalis Escherich 



Die Darmbakterien des Sauglings, 1886, 90. 



Morphology. Cocci oval, 0.2-0.3 (*i sometimes as short rods with a fission 



line. 

 Gelatin colonies. Small, not characteristic. 



Gelatin stab. In depth a thin whitish growth ; on surface little or no growth. 

 Potato. Growth rather abundant ; white. 

 Milk. Coagulated, acid. 

 Habitat. In menconium and faeces of milk-fed infants. 



