3O2 MANUAL OF BACTERIOLOGY. 



flagella which arise from all parts of the surface. It does 

 not form spores. It is not stained by Gram's method, but 

 it may be colored with the ordinary aniline dyes, when the 

 stain will frequently be somewhat irregular. It may be 

 stained in sections of tissues from cases of typhoid fever, 

 with the aniline dyes, such as Loffler's alkaline methylene- 

 blue. It is facultative anaerobic. It grows at ordinary 

 temperatures, better in the incubator, but grows rather more 

 slowly than B. coli commnnis. Gelatin is not liquefied. 



X, 



- ^ / I 



"* '-*. 



'" 



>/ \ 

 ' * N \ 1% 



Bacillus of typhoid fever. (X n 



surface colonies in gelatin appear whitish, with 

 irregular borders and more or less wrinkled surfaces, when 

 slightly magnified. It grows on the ordinary media, and the 

 growths are whitish. Bouillon is clouded. Milk becomes 

 slightly acid, but is not coagulated. In media containing 

 dextrose, acid is formed but no gas. In lactose-bouillon 

 neither acid nor gas is formed, although when grown in 

 milk the typhoid bacilli produce an acid reaction. The lac- 



