BACILLUS OF FOWL CHOLERA 253 



does not liquefy gelatine, and the colonies on the plate are 

 roundish with uneven edges. When grown in thrust- 

 cultures a delicate film appears on the surface, while a slight 

 whitish-grey coating develops on agar. A dirty yellow fur 

 appears on potato only at incubation temperature, and a 

 shining whitish deposit upon serum. 



A characteristic point in the staining of these microbes 

 is that the poles only are coloured by aniline dyes, the 

 centre remaining unstained. They discharge the colour 

 when treated by Gram's process. 



Other intestinal bacteria. — Besides the above, the Bacillus 

 butyricus, Vibrio rugula, and Bacterium coli commune are 

 met with in the intestinal canal, as well as the cholera 

 bacillus, typhoid bacillus, Vibrio proteus {Bacillus Finlder- 

 Prior), Bacillus neapolitanus (Bacillus Emmerich), Proteus 

 vulgaris, Vibrio Metschnikoffi, and in many cases the thrush- 

 fungus. [Various protozoa have also been described.] 



