DESCRIPTION OF PLATE I. 



FIG. i. Diphtheria bacilli (long form) from a young culture 

 on blood-serum. Loffler's blue, x 1000. 



FIG. 2. Diphtheria bacilli (short form) and Hoffmann's bacil- 

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

 blue, x looo. 



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. 



