92 MICROBES, FERMENTS, AND MOULDS. 



a. Cylindrical filaments, indistinctly articulated, mo- 



tionless. 

 a. Unramified, very slender filaments: 



(1) Short .................. Bacillus. 



(2) Long ...... ............ Leptotkrix. 



ft. Filaments repeatedly bifurcated (false ramiii- 



cations) ............... Cladothrix 



b. Spiral, movable filaments: 



(1) Short, faintly undulated ......... Sjriroclicete. 



(2) Long, flexible ............... Vibrio. 



(3) Short, rigid ............... Spirillum. 



(4) Rolled into mucilaginous mass ...... Myconostoc 



B Cells dividing cross-wise, and the daughter cells re- 



maining united, like packets tied with a crossed 



cord .................. Sardna. 



Most of the microbes of which we have now to speak 

 may be assigned to one or other of the genera given in 

 this scientific enumeration, and sometimes, on account 

 of their polymorphism, to several of these genera. 



Before making a more detailed study of some of 

 them, it may be interesting to glance at them as a 

 whole, following the order of classification given above. 



The genus Micrococcus (Hallier) includes the 

 spherical microbes, which are the most common and 

 the most widely diffused, probably because the spores 



^ and early stages of all the other forms 



V*V^* have this spherical shape before be- 



* /!>" coming elongated and assuming their 



"T ^fr O O O O 



. ; * adult form (Fig. 50). 



F*. 50. -Microbes Tm ' S g 6I1US ls Divided into two 



sections: the first includes Micro- 



coccus chromogenis, i.e. fabricators of 

 colouring matter an extremely interesting group, on 



