The similarity of this list to that representing the bacteriology of bronchitis is evident; there is the same multiplicity of microorganisms and the frequent occurrence of mixed infections. B. influenzæ is much less frequently found in the lung. The relative pathogenicity of the large group of microorganisms enumerated above is better indicated by the following list which shows what microorganisms have penetrated into the blood in autopsies performed on individuals with bronchopneumonia: Pneumococci 20 S. hemolyticus 23 S. viridans 1 Pneumococci, S. hemolyticus 2 No bacteria found 25 —— Total 71 Table XXXIV shows the percentage incidence of pneumococcus, hemolytic streptococcus, staphylococcus and B. influenzæ in the bronchi, lungs and blood and is inserted for comparison with the similar table (Table XXX) showing the incidence of these bacteria in lobar pneumonia. TABLE XXXIV ════════╤════════╤═════════════════╤═════════════════ │ NO. OF │ │ HEMOLYTIC │CULTURES│ PNEUMOCOCCI │ STREPTOCOCCI ────────┼────────┼────────┬────────┼────────┬──────── │ │ NO. │PER CENT│ NO. │PER CENT │ │POSITIVE│POSITIVE│POSITIVE│POSITIVE ────────┼────────┼────────┼────────┼────────┼──────── Bronchus│ 37│ 19│ 48.6│ 13│ 35.1 Lung │ 47│ 20│ 42.6│ 14│ 29.8 Blood │ 70│ 22│ 31.4│ 24│ 34.3 ────────┴────────┴────────┴────────┴────────┴──────── ════════╤═════════════════╤═════════════════ │ │ │ STAPHYLOCOCCI │ B. INFLUENZÆ ────────┼────────┬────────┼────────┬──────── │ NO. │PER CENT│ NO. │PER CENT │POSITIVE│POSITIVE│POSITIVE│POSITIVE ────────┼────────┼────────┼────────┼──────── Bronchus│ 22│ 59.5│ 28│ 75.7 Lung │ 13│ 27.7│ 23│ 48.9 Blood │ │ │ │ ────────┴────────┴────────┴────────┴────────