DESCRIPTION OF SPECIES 



439 



days moist, shining, white, and ele- 

 vated. Opaque at centre, trans- 

 parent at edges. Thread-like 

 granular white growth in stab-cul- 

 tures. Wavy, shining, white growth 

 in streak cultures, becoming dull 

 and of consistence of butter. Does 

 not liquefy gelatine. 



Agar plates and tubes — As in 

 gelatine but colonies more elevated 

 and opaque ; white, spreading, oily 

 growth in streak cultures. 



Potato — Thick, white, porcelain 

 growth, much elevated and with a 

 wav)' border. 



Milk — Not coagulated in 14 days 

 but becomes feebly acid. 



Aerobic. 



Non-pathogenic. 



MICROCOCCUS CINNABARBUS 



(Fliigge). 



Source and habitat — Air and water ; 

 thence to milk. 



Morphology — Ovoid coccus -9 m or 

 larger in diameter ; isolated in 

 pairs, or in tetrads. 



Staining reaction — Ordinary aniline 

 stains. 



Biology : cultural characters {includ- 

 ing biochemical features^ 



Bouillon — The medium becomes 

 soon turbid, with a reddish deposit, 

 very coherent and viscous, the 

 medium itself acquiring also a 

 certain viscosity. 



Gelatine plates and tubes — Small, 

 round colonies of a dull, red colour. 

 In gelatine stab or stroke cultures, 

 an abundant growth of a brick-red 

 or rose colour. Slight liquefaction 

 of the medium, but only after a 

 considerable length of time. 



Agar plates and tubes — Large, 

 spatula-shaped colonies with sinu- 

 ous borders, and of a yellowish 

 brick-red colour, turning later to 

 a rose tint. Soft, and with little 



coherence, separating itself easily 

 from the surface of the medium. 



Potato — Formation of a mucous 

 layer of a lemon-yellow colour, 

 sometimes red. Cultures have a 

 distinctly unpleasant odoiu-. 



Aerobic. 



Non-pathogenic. 



MICROCOCCUS CITREUS LACTIS 



(Conn). 



Source and hcdntat — Milk. 

 Morphology — Coccus ; -9 /t in diameter. 

 Staining reaction — Ordinary aniline 



stains. 

 Biology : cultural characters {includ- 

 ing biochemical features). 



Gelatinepiates and tubes — Smooth, 

 opaque, surface colonies, thin, flat, 

 and decidedly yellow. Gelatine 

 begins to dry before liquefaction 

 occurs. In stab-cultures needle 

 gro^vth is abundant and there is a 

 flat surface growth. 



Agar plates and tubes — Growth 

 sunken in middle. Abundant, 

 moist, of a brilliant yellow. 



Potato — Dry, abundant, yellow 

 growth. 



Milk — Rendered alkaline. No 

 other change. 



Aerobic. 



Non-pathogenic. 



MICROCOCCUS COMMUNIS LACTIS 



(Conn). 



Source and habitat — Milk. 



Morphology — Coccus, generally in 

 form of streptococcus elements ; 

 •8 to I /* in diameter. 



Staining reaction — Ordinar)- aniline 

 stains. 



Biology : cultural characters {includ- 

 ing biochemical features). 



Gelatine plates and tubes — Roimd 

 brown colonies, irregular in shape ; 



