Fig. 5. a. Nitrobactcr agilis, ATCC 12812. 

 The organism illustrated shows the typical flagel- 

 lation of the individuals in the culture studied. 

 The flagellation may be labeled lateral mono- 

 trichous. 



J 



Fig. 6. a. Hydrogenomonas facilis, ATCC 11228. 

 Polar monotrichous flagellation. 



)' 



,' ■ / e^ 



Fig. 7. a. Thiobacillus thiooxidans showing a typical normal polar mono- 

 trichous flagellum. b and c. Thiobacillus thioparus showing undulant polar 

 monotrichous flagella. 



23 



