At best our information for these years is unsatisfactory. It is greatly to be desired that individuals who have access not only to the current medical literature, but also to the vital statistics and other records for all countries possessing reliable records, and who are versed in the newer mathematical methods of demography, establish definitely the influenza prevalence and distribution during these interpandemic years. The difficulty in this work is that mortality statistics are unreliable and morbidity statistics are lacking. _Influenza in 1915–1916._—Until the end of 1915 there was no widespread distribution in the United States similar to that of 1900 and 1901, but at that time there developed a widespread epidemic in this country of similar or possibly slightly greater severity than that of fifteen years previously. Reference to the last table will show that during 1916 the annual death rate from influenza as reported in the United States Vital Statistics reached the rate of 26.4 per 100,000. According to V. C. Vaughan the literature of that time shows that this epidemic originated in the West, first attracting attention at Denver, and gradually spread over the country. Dr. Dublin of the Metropolitan Life Insurance Company gives the following table in which the deaths from influenza and pneumonia during the months of December, 1914, and January, 1915, are compared with deaths from the same cause during the months of December, 1915, and January, 1916: ═══════════════╤═══════════════════════════╤═══════════════════════════ Name of city │ Deaths reported as due to │ Deaths reported as due to │ influenza. │ pneumonia. ───────────────┼─────────────┬─────────────┼─────────────┬───────────── „ │ In 1915–16. │ In 1914–15. │ In 1915–16. │ In 1914–15. ───────────────┼─────────────┼─────────────┼─────────────┼───────────── Baltimore │ 57│ 12│ 219│ 101 Cincinnati │ 81│ 2│ 105│ 84 New Orleans │ 97│ 44│ 35│ 29 New York │ 494│ 62│ 2,067│ 1,207 Philadelphia │ 324│ 62│ 564│ 272 Providence │ 38│ 3│ 31│ 31 ───────────────┼─────────────┼─────────────┼─────────────┼───────────── Total │ 1,091│ 185│ 3,021│ 1,724 ───────────────┴─────────────┴─────────────┴─────────────┴───────────── Dublin states that the Industrial Department of the Metropolitan Life Insurance Company, covering the entire country and embracing ten millions of people, had deaths in the periods above mentioned, as follows: In December, 1914, and January, 1915, the number of deaths attributed to influenza was 165