The most noteworthy feature of the figures in Table XIV is the high proportion of pneumonias due to types of pneumococci found in the mouths of normal individuals, 93 cases or 88.6 per cent, being caused by Pneumococcus Types II atypical, III, and IV. This is in harmony with the results generally reported and is in all probability due to the fact that in patients with influenza pneumococci, which under normal conditions would fail to cause pneumonia, readily gain access to the respiratory tract and produce the disease. It is also of interest that with one exception the highly parasitic pneumococci of Types I and II were associated with pneumonias clinically lobar in type. Superimposed infection of the lungs with other types of pneumococci than those primarily responsible for the development of pneumonia occurred not infrequently in this group of cases either during the course of the disease or shortly after recovery from the first attack of pneumonia. Pneumococcus Type II infection was superimposed upon or shortly followed pneumonia caused by Group IV pneumococci in 4 instances, by Pneumococcus II atypical in 1 instance. In 1 case pneumonia due to Pneumococcus II atypical occurred three days after recovery from a Pneumococcus Type I pneumonia, in another case Pneumococcus Type III infection was superimposed upon a pneumonia originally due to a pneumococcus of Group IV. These cases are presented in detail in another section of this report, and in several instances were shown to be directly due to contact infection from patients in neighboring beds. In a similar manner, superimposed infection with S. hemolyticus at some time during the course of the pneumonia occurred in 13 cases in this group, with fatal result in all but one. Streptococcus infection occurred in pneumonia due to Pneumococcus II atypical once, to Pneumococcus Type III once, and to pneumococci of Group IV eleven times. Nine of these cases were free from hemolytic streptococci at the time of onset of the pneumonia, 4 showed a very few colonies of hemolytic streptococci in the first sputum culture made.