130 PATHOGENIC BACTERIA. 
Gonococci are of medium size, composed usually 
of two hemispheres separated by a narrow un- 
stained interval. Occasionally two pairs of cocci 
form a ‘‘tetrad.’? The cocci are usually within 
the leukocytes. 
(/) Stain another film by Gram’s method. The 
gonococci are decolorized. 
Il. ANTHRAX. 
1. Study the morphology and biology of cultures 
of Bacterium anthracis. 
2. Inoculate a guinea-pig as follows : 
Fic. 65.—Gonococcus in urethral puS; x 1000 (Frankel 
and Pfeiffer). 
(a) Remove the hair from a small area on the 
abdomen. 
