FIG. 206. Groups of bacteria stained to show their cilia 



ifts, an organism of decay characteristic of hay infusions; 5, Bacil- 

 lus typhi, the germ of typhoid fever: O, Bacillus vulgaris, single cells and 

 filaments: Z), Planococcus citreus, which forms yellow colonies on various sub- 

 strata; E, Pseudomonas syncyanea, which turns milk blue; F, other species 

 of Pseudomonas; G, Micro*i>ir<i emit ma, the germ of Asiatic cholera; //, Spi- 

 rillum undula, in water containing decaying fish, alga?, etc. ; /, another species 

 of Spirillum. After Migula 



229 



