CHAPTER XIII. 

 SPIROBACTERIUM (Spirillum). 



SPIRILLA are filaments of a spiral shape, motile, and 

 owing to their shape follow a spiral course when moving. 

 They are probably capable of forming minute bright spores. 



FIG. 107. SPIRILLUM TENUE, (i) SINGLY AND (2) IN SWARMS (AFTER COHN). 



i. Septic spirilla. These are found in all kinds of 

 putrefying organic substances, and are of three kinds. 



(a) Spirillum tenue. This is much finer and more wavy 

 than vibrio serpens, the turns being closer together and 

 spiral. Its length varies between 0*002 and 0-005 mm - j ^ 

 often forms continuous felted masses ; it is motile. 



