630 NON-PATHOGENIC BACILLI. 



278. BACILLUS FLUORESCEXS LIQUEFACIENS MIXUTISSIMUS 



(Unna and Tommasoli). 



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

 Possibly identical with the previously described species. 



Morphology. Bacilli with round ends, usually constricted in the middle, 

 from 1.5 to 2 u long and 0.3 u broad ; often united to form filaments. 



Biological Characters. An aerobic and facultative anaerobic, liquefy- 

 ing, motile, chromogenic bacillus. Forms a greenish-yellow, slightly fluo- 

 rescent pigment. Forms spherical spores. Grows rapidly in the usual cul- 

 ture media at the room temperature. Upon gelatin plates, at the end of 

 three to four days, the colonies consist of an outer yellowish- white zone of 

 transparent, liquefied gelatin and a thick, pale-brown centre which is made 

 up of grayish granular material. In gelatin stick cultures, at the end of 

 three days, a broad funnel of liquefied gelatin is formed above, which is 

 about one centimetre deep and five millimetres in diameter at the surface; 

 the liquefied gelatin is clouded, greenish-yellow, and contains some whitish 

 nocculi, while a thick whitish deposit accumulates at the bottom ; at the 

 end of eight days the gelatin is entirely liquefied and a thick, opaque, gray- 

 ish-yellow, fluorescent layer floats upon the surface. Upon the surface of 

 agar a slimy, moist, smooth, pale-brown layer is developed. Upon potato 

 a broad, compact, flat layer is quickly developed; this has a pale-brown 

 color and elevated, sharply defined margins; the potato acquires a dark 

 color. 



279. BACILLUS FLUORESCENS NIVALIS (Sclimolck). 



Found in ice water and snow from Norwegian glaciers. (Probably iden- 

 tical with No. 277.) 



Morphology. Short bacilli, often united in chains. 



Biological Characters. An aerobic liquefying, motile, chromogenic 

 bacillus. Forms a bluish-green, fluorescent pigment. Spore formation not 

 observed. Upon gelatin plates whitish, punctiform colonies are formed, 

 which spread out upon the surface as round discs and cause liquefaction of 

 the surrounding gelatin ; the non-liquefied gelatin in the vicinity acquires a 

 bluish-green fluorescence. In gelatin stick cultures liquefaction occurs in 

 funnel form, and the liquefied gelatin acquires a greenish fluorescence like 

 that of Bacillus liquefaciens fluorescens. Upon the surface of agar a 

 whitish layer is formed and the culture medium acquires a fluorescent color. 

 Upon potato a brownish layer is developed. 



280. BACILLUS LACTIS ERYTHROGENES (Hueppe). 



Synonym. Bacillus of red milk. 



Found in red milk, and by Baginsky in the faeces of a child. 



Morphology. Short bacilli with round ends, from 1 to 1.4^ long and 

 from 0.3 to 0.5 /f thick; in bouillon cultures may grow out into short fila- 

 ments. 



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

 bacillus. Produces a yellow pigment which is destroyed by acids and is 

 developed either in the presence or absence of light; and a red pigment 

 which is absorbed by the culture medium and is produced most abundantly 

 in an alkaline or neutral medium in the absence of light. Does not form 

 spores. The cultures give off an intense and disagreeable odor. Grows at 

 the room temperature in the usual culture media more rapidly at 28 to 

 35 C. \Jpongelatinplates small, spherical colonies are developed, Avhich 

 are at first grayish- white and later yellow in color; after a time the sur- 

 rounding gelatin is liquefied in saucer shape and acquires a pale-pink color. 

 In gelatin stick cultures a rather thin, round layer is developed upon the 

 surface, which is at first whitish and later yellow in color; the gelatin 



