=Presence of Pneumococcus in Cases of Influenza.=—It seemed of some importance to determine the prevalence of pneumococcus in cases of influenza, not because of any possibility that pneumococci might bear an etiologic relationship to the disease, but more by way of comparison with the prevalence of B. influenzæ, since both organisms are found in the mouths of normal individuals and are also frequently found together in the pneumonias that complicate influenza. The results obtained in cases of influenza early in the disease before the development of either a purulent bronchitis or of pneumonia are presented. The presence of pneumococcus was determined by the intraperitoneal inoculation of white mice with the saliva or sputum. Twenty-four cases examined on September 27 and 28 gave the results shown in Table IV. These patients had been in the hospital from two to five days at the time the determinations were made. TABLE IV PNEUMOCOCCUS IN CASES OF INFLUENZA ═══════════════════════════════════╤═════════════════╤═════════════════ │ NUMBER │ PER CENT ───────────────────────────────────┼─────────────────┼───────────────── Pneumococcus, Type I │ 0│ 0 Pneumococcus, Type II │ 0│ 0 Pneumococcus, Atypical II │ 0│ 0 Pneumococcus, Type III │ 2│ 8.3 Pneumococcus, Group IV │ 15│ 62.5 No pneumococci found │ 7│ 29.2 ───────────────────────────────────┴─────────────────┴───────────────── From November 27 to December 1, the pneumococci present in 47 consecutive cases of influenza were determined. In this group specimens of sputum were collected shortly after admission of the patients to the receiving ward of the hospital. The results are shown in Table V. TABLE V PNEUMOCOCCI IN CASES OF INFLUENZA ═══════════════════════════════════╤═════════════════╤═════════════════ │ NUMBER │ PER CENT ───────────────────────────────────┼─────────────────┼───────────────── Pneumococcus, Type I │ 0│ 0 Pneumococcus, Type II │ 0│ 0 Pneumococcus, Atypical II │ 2│ 4.3 Pneumococcus, Type III │ 0│ 0 Pneumococcus, Group IV │ 25│ 53.2 No pneumococci found │ 20│ 42.5 ───────────────────────────────────┴─────────────────┴─────────────────