A noteworthy feature of these lists is the multiplicity of microorganism found, namely, B. influenzæ, S. hemolyticus, pneumococcus, staphylococcus, S. viridans, B. coli, and M. catarrhalis. More than one microorganism is usually found in both bronchus and lung. In the one instance (Autopsy 472) in which B. coli alone has been found in the bronchus, B. coli and S. hemolyticus have been found in the lung and hemolytic streptococcus in the blood; it is evident that B. coli alone has not been responsible for the lesion. In one instance (Autopsy 487) B. influenzæ alone has been found in the lung but hemolytic streptococci have been found in the bronchus, pleura and blood of heart; with S. aureus alone in the lung (Autopsy 370), S. aureus, Pneumococcus IV and B. influenzæ have been found in the bronchus. With S. viridans alone in the lung (Autopsy 473), Pneumococcus III has been found in the pleura and in the blood of the heart and has doubtless had an important part in the production of pneumonia; S. viridans, M. catarrhalis and B. influenzæ have been found in the bronchus in this instance. No single microorganism is associated with the lesions but combinations of B. influenzæ with hemolytic streptococci or staphylococci are common (over 50 per cent). In Autopsy 422 B. influenzæ and Pneumococcus atypical II have been present in the lungs. Among 10 instances in which cultures have been obtained from the bronchus B. influenzæ is found 8 times, and in the 2 instances in which it has not been identified B. coli has been present. B. influenzæ has seldom been found (Table XXVII) in the presence of B. coli, and it is not improbable that B. coli outgrows and obscures the presence of B. influenzæ. Table LIV shows the per cent incidence of pneumococci, hemolytic streptococci, staphylococci and B. influenzæ in the bronchus, lung and heart’s blood with chronic bronchopneumonia and serves as an index of the readiness with which each of these microorganisms passes from bronchus to lung and from lung to the blood in this disease. TABLE LIV ═══════════╤══════════════╤══════════════╤══════════════╤══════════════ │ PNEUMOCOCCUS │ HEMOLYTIC │STAPHYLOCOCCUS│ B. INFLUENZÆ │ PER CENT │STREPTOCOCCUS │ PER CENT │ PER CENT │ POSITIVE │ PER CENT │ POSITIVE │ POSITIVE │ │ POSITIVE │ │ ───────────┼──────────────┼──────────────┼──────────────┼────────────── Bronchus │ 40.0│ 30.0│ 50.0│ 80.0 Lung │ 12.5│ 56.2│ 37.5│ 68.7 Blood │ 16.6│ 55.6│ 0│ 0 ───────────┴──────────────┴──────────────┴──────────────┴──────────────