302 



TYPHOID FEVER. 



Flagella. On being stained by the appropriate methods 

 (vide p. 104) the bacilli are seen to possess many long 

 wavy flagella which are attached all along the sides and to 

 the ends (Fig. 78). They are more numerous, longer, and 

 more wavy than those of the B. coli. 



Characters of Cultures. Stab cultures in peptone-gelatine 



V A 



FIG. 78. Typhoid bacilli, from a young culture on agar, showing 

 flagella. 



Stained by Van Ermengem's method. x 1000. 



give a somewhat characteristic appearance. On the surface 

 of the medium, growth spreads outwards from the puncture 

 as a thin film or pellicle, with irregularly wavy margin 

 (Fig. 79, A). It is semi-transparent, and of bluish- white 

 colour. Ultimately this surface growth may reach the wall 

 of the tube. Along the stab there is an opaque whitish 



