30 BACTERIA. 



the kind. Up to the present, however, micrococci, the 

 Bacillus anthracis, and many other organisms, cannot be said 

 to be supplied with flagella or cilia, and in many organisms 

 in which there seems to be independent movement, really 

 nothing but the so-called Brownian movement can be dis- 

 tinguished when they are examined in fluid, a movement 

 that may be observed equally well when particles of 



Photo-micrograph of Cladothrix Dichotoma with pseudo-branching filaments, 

 with well-marked tranverse divisions. X 1000. 



inorganic colouring matter are suspended in a fluid 

 medium and examined under the microscope. 



The simplest form of division or multiplication met with 

 in bacteria is that known as vegetative multiplication, in 

 which, taking as an example a short rod-shaped bacillus, 

 there is first an increase in the length of the rod, then a zone 

 of constriction in the middle of this lengthened rod, and then 



