G28 NON-PATHOGENIC BACILLI. 



also assumes a brownish cast. Potato culture .' A very rapid growth on po- 

 tato. In twenty-four hours the potato is colored a deep-brown color over 

 nearly its whole surface. We have in no case observed a previous blue color- 

 ation. The growth is brownish, thin, spreading-, and dry. Milk: The milk 

 very slowly becomes a light-chocolate color. The reaction is slightly alka- 

 line. Bouillon: In three days the bouillon has become slightly turbid. 

 Month-old cultures are a deep brown, with a tough, thick skin on the sur- 

 face. Effect upon nitrates : Nitrates are slowly reduced." 



Jordan remarks : "This is undoubtedly the 'bacillus of blue milk' de- 

 scribed originally by Hueppe." 



258. BACILLUS FUSCUS LIMBATUS (Scheibenzuber). 



Obtained from rotten eggs. 



Morphology. Short rods, occasionally united into filaments. 



Biological Characters. An aerobic and facultative anaerobic, non- 

 liquefying, actively motile, chromogenic bacillus. Produces a brown pig- 

 ment. Spore formation not observed. Grows at the room temperature in 

 the usual culture media. Upon gelatin plates colonies are developed in the 

 form of small brown masses of circular outline and often surrounded by a 

 paler marginal zone which is two to three times as broad as the brown in- 

 terior. In gelatin stick cultures a branching growth is seen along the line 

 of puncture, and the short branches are beset with small projections ; the 

 gelatin in the vicinity of the line of growth acquires a brown color. Upon 

 the surface a scanty development occurs. Upon the surface of agar a super- 

 ficial layer, beneath which the medium acquires a dark-brown color, Upon 

 potato a brown layer is developed. 



259. BACILLUS LATERICEUS (Eisenberg). 



Synonym. Ziegelroter bacillus (Adametz). 



Found in water. 



Morphology. Bacilli, from three to five times as long as broad; grow out 

 into short curved filaments. 



Biological Characters. An aerobic, non-liquefying, non-motile, chro- 

 mogenic bacillus. Forms a brick-red pigment. Grows very slowly at the 

 room temperature. Spore formation not observed. Upon gelatin plates 

 forms punctiform, brick- red colonies ; under a low power these are seen to 

 be spherical, finely granular, and brownish-red in color ; the opaque centre 

 is surrounded by a more transparent marginal zone. In gelatin stick cultures 

 a tolerably thick, slimy, brick-red layer is developed ; very scanty growth 

 along the line of puncture. Upon potato a brick-red layer, 



260. BACILLUS SPINIFERUS (Unna). 



Found upon the surface of the body in cases of eczema seborrhceicum. 



Morphology. Straight or slightly curved bacilli, 2 /* long and 0.8 to 

 1 f-t broad ; solitary or in pairs, frequently seen in irregular groups or lying 

 parallel to each other in bundles. 



Biological Characters. An aerobic, non-liquefying, chromogenic ba- 

 cillus. Forms a grayish-yellow pigment. Spore formation not observed. 

 Grows rather slowly at the room temperature. Upon gelatin plates, at the 

 end of eight days, the superficial colonies are prominent, shining, skin- 

 colored, and circular in outline, from one to two millimetres in diameter ; 

 under a low power they are seen to be irregular in outline, covered with 

 coarse projections ; later finely granular, with a margin surrounded by small, 

 thorn-like projections, which after a time form a radiating aureole and 

 give the colony a porcupine-like appearance. In gelatin stick cultures, at 

 the end of six days, an irregular, wrinkled layer about two millimetres broad 

 is formed upon the surface; this is grayish-yellow upon the folds and bluish 



