THE CLASSIFICATION OF BACTERIA 249 



Gelatin stab. But little growth in depth, but in the upper portion of the line 

 of puncture a radiately filamentous growth, as in plate cultures. But 

 slight growth at yj. Indol not produced, or doubtful. 



Habitat. Isolated from the intestines of fowls. 



B. alantoides Klein : Centralblatt f. Bakteriol., VI. 



Proteus Zenkeri Kuhn : Archiv f. Hygiene, XIII. 



According to Kruse, identical with the preceding. 



120. B. Zenkeri (Hauser) 



Proteus Zenkeri Hauser: Ueber Faulnissbakterien, 1885. 

 Indistinguishable from, and probably identical with, the preceding. 



121. B. arborescens Ravenel 



B. arborescens non-liquefaciens Ravenel: I.e., 39. 



Morphology. Bacilli slender rods, 7-13 times their breadth ; occur singly and 

 in chains of several elements. 



Gelatin colonies. In 48 hours bluish indistinct cloudy dots, easily over- 

 looked, resembling colonies of B. ramosus, but less distinct and finer, i.e. 

 radiate, filamentous, branched. 



Gelatin stab. In depth, fine outgrowths, becoming beaded below; on the 

 surface, growth irregular, white, concentric, thicker in the centre. 



Agar slant. Growth a faint, colorless line, with lines of wavy colonies on 

 each side. 



Bouillon. Slightly turbid, becoming clear. 



Pepton rosolic acid solution. Unchanged. 



Litmus milk. Coagulated in 10 days, decolorized, acid. 



Glucose bouillon. No gas. Indol negative. Optimum temperature 36 . 



Habitat. Soil. 



122. B. lethalis Babes 



Proteus lethalis Babes : Progres Medical Roumain, 1889. 



Morphology. Bacilli 0.8 : 1.5 \i.\ thick, short, flask-shaped rods to filaments. 

 Gelatin colonies. Raised, whitish, translucent ; later, outgrowths, which 



branch on the surface. 

 Agar slant. Growth a thick, opaque, yellowish layer. 

 Potato. Growth brownish. 

 Pathogenesis. Subcutaneous inoculations of mice and rabbits cause death in 



4 days, with local oedema, septicaemia, enteritis, peritonitis. 

 Habitat. Isolated from lung gangrene in man. 



