PLATE VI. 



PATHOGENIC BACTERIA. 



FIG. 1. Bacillus of influenza in bronchial mucus. X 1,000. Photo- 

 micrograph by Frankel. 



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

 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. Photomicro- 

 graph by Frankel and Pfeiffer. 



FIG. 4. Micrococcus pneumoniae crouposae in sputum of a patient with 

 pneumonia. X 1,000. Stained by Gram's method. Photomicrograph by 

 Frankel and Pfeiffer. 



FIG. 5. Micrococcus pneumoniae crouposae in blood of rabbit. X 1,000. 

 Photomicrograph made at the Army Medical Museum, Washington, by Gray. 



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

 method. X 1,000. Photomicrograph made at the Army Medical Museum, 

 Washington, by Gray. 



