THE CLASSIFICATION OF BACTERIA 6l 



Blood serum. Scaly colonies ; medium not liquefied. 

 Potato. Thin white colonies, no growth on old potato. 

 Milk. Not coagulated ; rendered acid after some time. 

 Habitat. Faeces of healthy children fed on a flesh diet. 



12. Str. septicus Babes 



sir. sepHcus-liquefaciens Babes : Septic Prozesse Kindesalters, 1889. 



Morphology. Cocci 0.3-0.4 ; in pairs — short chains. Stain by Gram's method. 



Gelatin stab. Along line of stab, in 24 hours, a thin, granular whitish growth. 

 On the surface, growth depressed, becoming funnel-formed. Liquefied 

 gelatin but slightly clouded ; upon walls of funnel flat white leafy jagged 

 colonies. 



Agar slant. Small white glistening transparent colonies. 



Blood serum. A scarcely visible granular layer. 



Patfwgenesis. Mice and rabbits inoculated subcutaneously show a local inflam- 

 mation, with oedema and death in about 6 days. Cocci in effused serum, 

 in blood and spleen. 



Habitat. Isolated from the blood of a child who died of septicaemia. 



13. Str. liquefaciens Sternberg 



Manual of Bacteriology, 1892, 613. 

 Morphology. Cocci round-oval, 0.4-0.6; solitary — pairs — short chains. 

 Gelatin stab. Liquefaction occurs rapidly along the entire line of puncture, 



and in 7 days tube completely liquefied. 

 Agar stab. A beaded growth along line of puncture, with but scanty growth 



on the surfece. 

 Potato. Growth thin, limited, dry, white. 

 Pathogenesis, Rabbits and guinea pigs, negative. 

 Habitat. Isolated from liver of yellow fever cadaver, and from contents of the 



intestine. 



14. Str. albus Sternberg 



Weisser Streptococcus Maschek : Jahresber. der Oberrealschule zu Leitmeritz, 1887. 

 St. albus Sternberg : Manual of Bacteriology, 1892. 



Morphology. Streptococci, which show independent movements only during 



period of division ( ?) . 

 Gelatin colonies. Flat, round, with white margins ; liquefaction crateriform. 

 Gelatin stab. Develop chiefly on the surface ; liquefaction rapid ; a white 



sediment. 

 Potato. A slimy white growth. 

 Habitat. Water. 



