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. septicus-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. 



Pathogenesis. 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 surface. 



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 cratejiform. 

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



sediment. 



Potato. A slimy white growth. 

 Habitat. Water. 



