92 BACTERIOLOGY 



Agar colonies. In 24 hours, at 37" C, surface colonies round, white, and 

 slightly raised ; microscopically, brown, granular, light yellowish, thicker 

 in the middle and with a narrow thin translucent border, 1-1.5 mm.; 

 radially striped. 



Agar slant. Growth flat, only slightly raised ; white, becoming yellowish 

 toward the centre ; with a thin border. 



Gelatin slant. A whitish gray streak, becoming slowly liquefied, with yellow- 

 ish pulverent masses in liquid gelatin. 



Gelatin stab. Growth in depth yellowish brown, beaded ; on surface growth 

 white, flat, spreading, becoming sunken; later a funnel with grayish 

 white — yellowish sediment. 



Glucose gelatin stab. No gas ; a growth in depth. 



Litmus bouillon. Reduced. 



Milk. In 8-9 days at 37° C. ; coagulated. 



Litmus milk. In 4 days, red. 



Potato. At 37° C. ; growth grayish -yellowish. 



Blood serum. Not liquefied ; growth yellowish where thickest. 



Habitat. Associated with an erythema of the skin, simulating anthrax. 



49. M. expositionis 



M. No. 34, Conn. : I.e., 1894, 77, 



Morphology. Cocci 0.4 ju, with characteristics of merismopedia. Grow at 



35° C. 

 Gelatin colonies. Surface: A liquid pit, with a nucleus, and cloudy edges. 

 Gelatin stab. A good growth in depth ; on the surface a slight growth, not 



spreading, rather thick, and does not very thoroughly liquefy the gelatin. 

 Agar slant. Growth thick, moist, with thin edges tinged with yellow. 

 Potato. No visible growth. 

 Bouillon. Slightly turbid, with a tough yellowish sediment, becoming in 4 



weeks clear. 

 Habitat. Milk. 



50. M. Finlayensis Sternberg 



Report on Etiology and Prevention of Yellow Fever, Washington, 1891, 219. 



Morphology. Cocci 0.5-0.7 /z, solitary — pairs — tetrads — irregular masses. 

 Gelatin stab. A good growth in depth ; on the surface a crateriform depres- 

 sion, lined with a viscid, light yellow layer of cocci. 

 Agar slant. Growth light yellow, viscid. 

 Pathogenesis. Negative for guinea pigs and rabbits. 

 Habitat. In cultures from liver and spleen of yellow fever cadaver. 



