BACTERIA IN INFLUENZA. 373 



3. The presence of the bacilli corresponded with the course of the 

 disease, and they disappeared with the cessation of the purulent 

 bronchial secretion. 



In his preliminary report of his investigations Pfeiffer says : 

 " Numerous inoculation experiments were made on apes, rabbits, 

 guinea-pigs, rats, pigeons, and mice. Only in apes and rabbits 

 could positive results be obtained. The other species of animals 

 showed themselves refractory to influenza." 



PLATE VI. 



PATHOGENIC BACTERIA. 



FIG. 1. Bacillus tuberculosis in giant cell, x 1,000. Photomicrograph 

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



FIG. 2. Bacillus tuberculosis from a culture 011 glycerin-agar. x 1,000. 

 Photomicrograph by Frankel and Pfeiffer. 



FIG. 3. Bacillus tetani from an agar culture, x 1.000. Photomicro- 

 graph by Frankel and Pfeiffer. 



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

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

 Frankel and Pfeiffer. 



FIG. 5. Bacillus septicsemise haemorrhagicce ("bacillus of fowl cholera") 

 in blood from the heart of an inoculated pigeon, x 1,000. Photomicro- 

 graph by Frankel and Pfeiffer. 



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. 



