24 MORPHOLOGY OF BACTERIA. 
Are the individuals stained uniformly or irregu- 
larly, deeply or faintly? In the rods are the ends 
more deeply stained than the centers (polar stain- 
ing)? 
(@) Measure the various kinds and make draw- 
ings of them. 
II. Demonstration of Motion. 
(a) To a small drop of water on a cover-glass add 
a very little carmine or Bismarck-brown. 
Fic. 12.—Bacillus suipestifer, showing flagella. 
(4) Mount in the same manner as a hanging-drop 
preparation. 
(c) Examine with the } inch objective. 
Are the bits of pigment in motion? Do they 
change their position relative to one another, or do 
they dance about in one place? This is the so- 
called Brownian movement. 
