BACTERIUM AND SPIRILLUM 49 



EXERCISE XVIII 



THE MORPHOLOGY OF BACTERIUM AND SPIRILLUM 



75; Work for this Exercise. — Examine very carefully and 

 describe fully the cultures of a Bacterium and a Spirillum made 

 at the last exercise. 



Make and examine, microscopically, hanging-drop and stained 

 cover-glass preparations from each of the cultures. Describe 

 the appearance of the individual bacteria in each. 



Make a drawing magnified 1000 diameters of a few individu- 

 als from each of the stained preparations from the agar cultures. 



State fully the characters of these two genera and mention 

 the diiferential characters between Bacillus and Bacterium. 



