TYPHOID FEVER. 



255 



The organisms are actively motile, the motility prob- 

 ably being caused by the numerous flagella with which 



FIG. 73. Bacillus coli communis, from an agar-agar culture; x 1000 (Itzerott 



and Niemann). 



the bacilli are provided. The flagella stain well by 

 Ivoffler's method, and, as they are numerous (eighteen 



FIG. 74. Bacillus typhi, from an agar-agar culture six hours old, showing the 

 flagella stained by Lofflers method; x 1000 (Frankel and PfeifTer). 



to twenty) and readily demonstrable, the typhoid bacillus 

 is the favorite subject for their study. 



