36 DAVID J. DAVIS 



FIG. 2. Influenza-like bacilli from 24 hour blood-agar culture isolated from 

 pertussis sputum. Some of the bacilli show polar staining. Magnified 1,200 diameters. 



FIG. 3. Phagocytosis of influenza-like bacilli in sputum of pertussis patient. 

 Magnified 1,200 diameters. 



FIG. 4. Twenty -four cultures of influenza-like bacilli from pertussis sputum 

 showing marked tendency to thread formation. Magnified 1,200 diameters. 



FIG. 5. Influenza-like bacilli in smear of sputum from case inoculated with 

 these organisms. Magnified 1,200 diameters. 



FIG. 6. Phagocytosis of leucocytes by endothelial cells seen in peritoneal exudate 

 of guinea-pig injected with the influenza-like bacilli. Magnified 1,200 diameters. 



