DESCRIPTION OF SPECIES 



421 



Staining reaction — Ordinary aniline 

 stains. 



Biology : cultural characters {includ- 

 ing biochemical features). 



Gelatine plates atid tubes — Small 

 circular greyish-white colonies. 



On agar — Greyish-white growth 

 occurs. 



On potato — A greyish-white 

 growth. 



Milk — Make it viscid and shiny. 



Non-pathogenic. 



BACIIiliUS LA.CTIS SAPONACEI 



(Weigmann and Zirn). 



Source and habitat — Soapy milk. 



Morphology — Short bacillus. 



Staining recu:tion — Ordinary aniline 

 stains. 



Motility — N on-motile. 



Spore formation — None. 



Biology : cultural characters {includ- 

 ing biochemical features) — The 

 most favourable temperature is 

 10° C. 



Gelatine plates and tubes — ^White 

 colonies with yellowish centres, later 

 becoming yellow throughout but 

 without special markings. Slow 

 liquefaction. In gelatine stab- 

 cultures a funnel forms, at the 

 bottom of which lie the yellow 

 flocculi. 



Agar plates and tubes — In agar 

 stab-cultures, luxuriant growth, 

 yellow in centre, later over whole 

 growth. 



Potato — A waxy yellow shiny 

 growth. 



Milk — Is not coagulated but 

 becomes shiny and tenacious. The 

 culture gives off an odour of soap. 



Aerobe — Facultative anaerobe. 



Non-pathogenic. 



bachjIjUS lactis viscosus 



(Adametz). 

 Source and habitat — Butter and slimy 



cream ; in water (Zimmerman). 

 Morphology — Short rods with round 



ends. 

 Staining reaction — By Gram's method. 

 Capsule ; motility — Non-motile ; cap- 

 sule stains. 

 Biology : cultural characters {includ- 

 ing biochemical features). 



Bouillon — Becomes very cloudy ; 

 viscous, shining, and may be drawn 

 out in threads. 



Gelatine plates and tubes — Colo- 

 nies like ele\'ated droplets. I n stab- 

 cultures wide-spread growth but 

 not luxuriant. 



Potato — Abundant, white, ten- 

 acious growth. 



Milk — Is not coagulated ; feebly 

 alkaline ; becomes viscous, shiny, 

 and may be drawn out in threads ; 

 makes cream shiny. Capsule of 

 bacillus more marked in milk 

 cultures. 

 Non-pathogenic. 



BACILLUS LACTERICUS 

 (Adametz). 



Source and habitat — Milk, air, etc 



Morphology — Short rods p)oihted at 

 both ends ; 0-8 to i-6Mlong, 0-4 to 

 0-6 /t thick. 



Staining reaction — Stains by Gram's 

 method. 



Motility — Non-motile. 



Biology: cultural characters {includ- 

 ing biochemical features). 



Bouillon — remains clear ; slight 

 indol production. 



Gelatine plates and tubes — 

 Round, reddish-brown colonies, 

 opaque, smooth edges. No lique- 

 faction. In gelatine stab-cultures 

 a reddish-brown growth. 



Agar plates and tubes — Reddish- 



