GENERAL CHARACTERISTICS OF BACTERIA. 39 



unequal at different portions. Spore formation also 

 causes an irregularity of the cell outline (Fig. 12). 



The bacilli divide only in the plane perpendicular to 

 their long axis. A classification, therefore, of bacilli 



FIG. 5. 



FIG. 6. 



^~ ^-^ 



i, single and in threads. 



\& j3fc > * > 7 . \ /*V&~ OF T 



$Sg\ ( UNWEF 



^f|-/^|^j V.C/Li^^ 



Small bacilli, mostly in pairs. 



according to their manner of grouping is much simpler 

 than in the case of the cocci. We may thus have bacilli 

 as isolated cells, as pairs, or as longer or shorter chains. 

 3. Spiral Form, or Spirillum. The members of the 

 third morphological group are spiral in shape, or rather 



