════════╤════════╤═════════════════╤═════════════════ │ NO. │ │ │EXAMINED│ PNEUMOCOCCUS │ S. HEMOLYTICUS ────────┼────────┼────────┬────────┼────────┬──────── │ │ NO. │PER CENT│ NO. │PER CENT │ │POSITIVE│POSITIVE│POSITIVE│POSITIVE ────────┼────────┼────────┼────────┼────────┼──────── Bronchus│ 29│ 9│ 31.0│ 15│ 51.7 Lung │ 37│ 16│ 43.2│ 18│ 48.6 Blood │ 50│ 12│ 24.0│ 22│ 44.0 ────────┴────────┴────────┴────────┴────────┴──────── ════════╤═════════════════╤═════════════════ │ │ │ STAPHYLOCOCCUS │ B. INFLUENZÆ ────────┼────────┬────────┼────────┬──────── │ NO. │PER CENT│ NO. │PER CENT │POSITIVE│POSITIVE│POSITIVE│POSITIVE ────────┼────────┼────────┼────────┼──────── Bronchus│ 16│ 55.2│ 23│ 79.3 Lung │ 10│ 27.0│ 19│ 51.4 Blood │ │ │ │ ────────┴────────┴────────┴────────┴──────── Comparison of the percentage incidence of the organisms which have to be found associated with bronchiectasis and with purulent bronchitis unaccompanied by bronchiectasis shows that there is no noteworthy difference in the occurrence of pneumococci, hemolytic streptococci or B. influenzæ within the bronchi. When allowance is made for the difficulty of demonstrating B. influenzæ in the presence of a large number of other microorganisms, it is not improbable that this organism has been constantly present in the purulent contents of the bronchi with purulent bronchitis, with and without bronchiectasis. Pneumococci, streptococci and staphylococci are each present in the bronchi in about one-half of the instances of bronchiectasis and mixed infections are very common, S. viridans, B. coli and M. catarrhalis being occasionally found in the bronchi. The table shows that pneumococci, streptococci and staphylococci show no greater tendency to enter the lungs and blood when bronchiectasis and purulent bronchitis coexist than with purulent bronchitis alone. Moderate dilatation of the small bronchi at the base of the left lung was found in several instances eight days after onset of symptoms referable to the respiratory passages. Advanced, diffuse dilatation of the bronchi was seldom seen before the lapse of two weeks, and bronchiectasis with formation of spherical or cylindrical cavities was found with few exceptions three weeks after onset of the fatal illness. Long continued, purulent bronchitis does not necessarily produce dilatation of the bronchi. It is noteworthy that the average duration of the fatal illness in 137 instances of pneumonia and purulent bronchitis with no bronchiectasis was 12.5 days, whereas the average duration of 49 instances of pneumonia with purulent bronchitis and bronchiectasis was only 16.5 days.