GENERAL MORPHOLOGY AND PHYSIOLOGY. 127 



contractility of the protoplasmic contents; for if 

 any drawing or propelling organ existed in 

 proportion to the length of the organism, it would 

 probably have been visible. But in many cases the 

 organism is undoubtedly provided with a vibratile 



FIG. 51. 



i. Coccus with flagellum. . 2. Similar coccus dividing with two flagella. 

 3. Colony of flagellated macrococci of Beggiatoa roseopersicina. 4. Short 

 rod from the same Beggiatoa with flagella [all after Zopf]. 5. Bacillus 

 with flagella [from a photograph by Koch]. 6. Bacillus subtilis [after 

 Brefeld]. 7, 8. Short rod-forms of Beggiatoa roseopersicina with one 

 flagellum [after Zopf]. 9. Very long rod of the same, with flagellum at 

 both ends [after Warming]. 10. Vibrio, with double flagellum at each 

 end [after Warming]. II. Vibrio, with flagella [from a photograph by the 

 author]. 12. Spirillum with flagella [after a photograph by Koch]. 

 13. Spirillum with flagella [after Zopf]. 14. Spirillum with double flagella 

 [after Zopt]. 15. Beggiatoa roseopersicina with a triple flagellum at one 

 end; and 16. with a double flagellum at both ends [after Warming]. 



lash or flagellum at one end, or with one or more 

 at both ends (Fig. 5 i). 



