92 MICROBES, FERMENTS, AND MOULDS. 



a. Cylindrical filaments, indistinctly articulated, mo- 



tionless. 

 a. Unramified, very slender filaments : 



(1) Short Bacillus. 



(2) Long Leptothrix. 



. Filaments repeatedly bifurcated (false ramifi- 

 cations) Cladothrix. 



b. Spiral, movable filaments: 



(1) Short, faintly undulated Spirochcete. 



(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 Sarcina. 



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 



>p>" a have this spherical shape before be- 



* cSr/l coming elongated and assuming their 



* ;v adult form (Fig. 50). 



rig. so. -Microbes Tnis g enus is divided into two 



crocoJus\^^. sections: the first includes Micro- 



coccus chromogenis, i.e. fabricators of 



colouring matter an extremely interesting group, on 



