CHAPTER X. 



BACILLUS : NON-PATHOGENIC FORMS. 



SEPTIC bacilli. 



(a) Bacillus subtilis (hay-bacillus). The elementary rods 

 are of various lengths from 0*002 to 0*006 mm., and are 



FIG. 44. FROM A CULTURE OF BACILLUS SUBTILIS (HAY-BACILLUS). 



Various forms between single bacilli and leptothrix. 



Magnifying power about 700. 



about 0-002 mm. in thickness. According to Cohn 1 



at a temperature of 21 C. division into two requires 



1 Loc. dt. 



