PLATE VI. 



PATHOGENIC BACTERIA. 



FIG. 1. Bacillus of influenza in bronchial niucus. x 1,000. Photo- 

 micrograph by Frankel, 



FIG. 2. Bacillus of influenza in bronchial mucus, after the termina- 

 tion of the febrile period. The bacilli are for the most part in pus cells. 

 X 1,000. Photomicrograph by Frankel. 



FIG. 3. Bacillus tetani from an agar culture. x 1,000. Photo- 

 micrograph by Frankel and Pfeiffer. 



FIG. 4. Micrococcus pneumonias crouposse in sputum of a patient 

 with pneumonia, x 1,000. Stained by Gram's method. Photomicro- 

 graph by Frankel and Pfeiffer. 



FIG. 5. Micrococcus pneumonise crouposse in blood of rabbit, x 

 1,000. Photomicrograph made at the Army Medical Museum, Washing- 

 ton, by Gray. 



FIG. 6. Bacillus of hog cholera, showing flagella. Stained by 

 Loffler's method. X 1,000. Photomicrograph made at the Army Medi- 

 cal Museum, Washington, by Gray. 



