DEMONSTRATION OF FORM. “23 
In the hanging-drop preparations are the indi- 
vidual bacteria spherical, rod-shaped, or spiral? 
If rod-shaped, are the ends pointed, sounded, or 
square? Are the bacteria motile?’ Are they single 
a & ce é 
; te ule ale oe 
L/D Pr a 
Fic. 10.—Diagram illustrating the morphology of the 
bacilli: a, 6, ¢, various forms of bacilli; d, e, bacilli with 
flagella; f, chain of bacilli, individuals distinct; g, chain 
of bacilli, individuals not separated (McFarland). 
c 
a b oo 
ne 
Fic. 11.—Diagram illustrating the morphology of the 
spirilla: @, 5, ¢, spirilla ; d, e, spirocheeta. 
or united in pairs, fours, irregular masses, or chains? 
Preserve the hanging-drop preparations for further 
study. 
(c) Repeat these observations on the stained prep- 
arations. 
1 See 2 II., page 24. 
