DESCRIPTION OF PLATE I. 



Fig. I. — Diphtheria bacilli (long form) from a young culture on 

 blood-serum. LofHer's blue, x looo. 



Fig. 2. — Diphtheria baciUi (short form) and Hoffmann's bacillus. 

 From young cultures on blood-serum. Loffler's blue. 



X 1000. 



Fig. 3. — Pneumococci in sputum from a case of pneumonia. 

 Stained with dilute carbol fuchsin and thoroughly washed. 

 X 1000. 



Fig. 4. — Anthrax bacilli. The lower portion of the field shows 

 bamboo-like chains and spores, and is taken from cultures. 

 Methylene blue, x 1000. The portion showing spores is 

 stained with carbol fuchsin, decolorized by brief immersion 

 in methylated spirit, and counterstained in methylene blue. 



Fig. 5. — Pus showing streptococci. Stained by Gram's method, 

 counterstained with eosin. x 1000. 



Fig. 6. — Pus showing gonococci and staphylococci. Stained by 

 Gram's method and counterstained with dilute carbol fuchsin. 

 X 1000. 



