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 about 



Fio. 39. FROM A CULTURE OF BACILLUS SUBTILIS (HAY-BACILLUS). 



Various forms between single bacilli and leptothrix. 

 Magnifying power about 700. 



0'002 mm, in thickness. According to Cohn 1 at a tempera- 

 ture of 21 C. division into two requires about one hour and a 

 quarter, at 35 C. only about twenty minutes. 

 1 Loc. eit. 



