20 



K S S K N T I A L S OF BACTERIOLOGY. 



Reproduction. Bacteria multiply through .simple division or 

 fission as it is called. Spore formation is simply a resting stage 



FIG. 3. 



Flagella. 



and not a means of multiplication. To accomplish division 

 the cell elongates, and at one portion, usually the middle, the 



FIG. 4. 



3 



Division of a Micrococcus. (After Mac6.) 



(1 1) 



s N-_ x _-'x.._t^ / 



Division of a Bacillus. (After Mace".) 



cell- wall indents itself gradually, forming a septum and dividing 

 the cell into two equal parts, just as occurs in the higher plant 

 and animal cells. See Fig. 4. 



