214 SPECIAL BACTERIOLOGY 



SPH^ROCOCCUS ACIDI LACTICI. 



Found in fresh milk; small cocci, occurring as diplococci or 

 arranged in clusters. 



Biological Characters. Facultative anaerobe. 



On Gelatine Plates. Round, white,, non-liquefying colonies. 



Milk is coloured red and coagulated with the formation of an acid. 



STREPTOCOCCUS ACIDI LACTICI. 



Found in curdled milk ; small cocci, arranged in chains. 



Biological Characters. 



On Gelatine Plates. Round, white, non-liquefying colonies. 



In Gelatine Stab Cultures the growth is entirely confined to the stab. 



Milk is coagulated with the formation of an acid. 



MICROCOCCUS ACIDI LACTIS LIQUEFACIENS. 



Found in butter ; oval cocci, occurring in diplococci or tetrads. 



Biological Characters. Facultative anaerobe ; optimum tempera- 

 ture 21 C. 



On Gelatine Plates. Small round, white, liquefying colonies. 



In Gelatine Stab Cultures. A liquefying, funnel-shaped growth, with a 

 film on the surface. 



Milk is coagulated with the formation of an acid. The casein is not 

 peptonised ; in one to two weeks it acquires a musty odour. 



STREPTOCOCCUS HOLLANDICUS. 



Found in the ropy whey used in making Edam cheese. 



Microscopical Appearances. Occurs in pairs and frequently in 

 long chains. 



Actions. When sterile milk is inoculated with this organism it 

 becomes sour and ropy in twelve to fifteen hours at 25 C. 



B. -BACILLI. 

 BACILLUS ANAEROBIUS (FLUGGE), II., III., IV. 



Three different species of rods found several times by Flugge in 

 milk that was cooked one and a half hours. Species III. and IV. 

 form spores. 



