THE CLASSIFICATION OF BACTERIA 245 



Milk. Coagulated, acid, becoming yellowish. 



Potato. Growth yellowish white, raised. Albuminous fluids give a putrefac- 

 tive odor and an alkaline reaction. 



H 2 

 Gas. In glucose and saccharose bouillon; no gas in lactose bouillon. ~~" = ~' 



HjS positive. Indol positive. Urea converted into ammonia. 

 Pathogenesis. Not properly pathogenic to the smaller animals. Injections 



of large quantities of filtered cultures cause toxaemia. 

 Habitat. Commonly found in putrefying fluids, water, etc 



108. B. mirabilis (Hauser) Trev. 



Proteus mirabilis Hauser: I.e. 



B. mirabilis Trevisan : Genera, 1889, 17. 



A variety of B. vulgaris. Morphological and cultural characters as above ; 



may liquefy gelatin a little more slowly. Deep colonies in gelatin coch- 



leate. 

 Habitat. Isolated from putrefying fluids, etc. 



109. B. No. VII Pansini 

 Virchow's Archiv, CXXII. 



From descriptions, indistinguishable from B. vulgaris. 

 Habitat. Isolated from sputum. 



no. B. sulphureus (Holschewnikoff) 



Bact. sulphureum Holschewnikoff: Ann. de Microgr., 1889, 261. 



In morphological and cultural characters, apparently identical with B. vulgaris. 

 Milk. Remains unaltered, but gradually becomes peptonized without coagula- 

 tion, and has a yellowish color. H 2 S produced on cooked egg. 

 Habitat. Water. 



in. B. septicus (Babes) 



Proteus septicus Babes: Septische Processe des Kindesalters, 1889. 

 B. proteus-septicus Kruse : Flugge, Die Mikroorganismen, 1896, 279. 



Morphology . Bacilli middle-sized, 0.4 /* thick, length variable, comma forms 



to filaments. 

 Gelatin colonies. Like those of B. vulgaris. 

 Potato. Growth elevated, bright brown. 

 Agar slant. Growth a reticulated layer. 



Pathogenesis. Subcutaneous inoculations of mice cause death by septicaemia. 

 Habitat. Isolated from the organs of a child dead with septicaemia symptoms. 



