242 BACTERIOLOGY. 



gelatine. They occur contaminating plate-culti- 

 vations. 



Bacterium violaceum, Bergonzini. Cells 

 similar to Bacterium termo, '6 i p thick, 2 3 p, 

 long. They occur on white of egg, forming a 

 violet pigment. 



Bacterium brunneum, Schroter. Motile 

 rods, producing a brown colour. They were ob- 

 served on a rotting infusion of maize. 



Bacterium fluorescens putidum (Bacillus 

 fluorescens putidus, Fliigge). Short rods with 

 rounded ends ; motile ; spore-formation not known. 

 They form small dark colonies with a greenish 

 sheen and penetrating odour. In test-tubes they 

 produce a pale-grey turbidity, and after three days 

 colour the medium with a greenish tinge spread- 

 ing down from above. On potatoes they rapidly 

 develop a brownish layer. They occur on de- 

 composing substances, producing a greenish 

 coloration. 



Bacterium fluorescens liquefaciens (Bacil- 

 lus fluorescens liquefactens, Fliigge). Short rods with 

 rounded ends. Colonies on plates develop an iri- 

 descence around them. In test-tubes a similar 

 iridescent sheen is produced. On potatoes they 

 develop a brownish layer. 



Bacterium urese (Micrococcus urece, Cohn). 

 Cocci 1*25 2 [L in diam., singly or in chains, and 

 rods. The rods split up by division into chains of 

 cocci, and the latter are finally set free. The cocci 



