The mortality statistics of the United States Census Bureau furnish us with a valuable index of the relative frequency of the various disease processes which determine the death rate of the community. They are based on the transcripts of death certificates received from the so-called registration area, which in 1920 had an estimated population of 87,486,713. The total number of deaths reported in 1920 was 1,142,558, a rate of 13.1 per 1,000 of the population. It is true that the epidemic of influenza was still a factor of some importance at that time. The rate for 1916, however, was fourteen, for 1917 fourteen and two-tenths, for 1918 eighteen and one-tenth and for 1919 twelve and nine-tenths per 1,000 of the population. The registration area now includes thirty-four states:—California, Colorado, Connecticut, Delaware, Florida, Illinois, Indiana, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, New Hampshire, New Jersey, New York, North Carolina, Ohio, Oregon, Pennsylvania, Rhode Island, South Carolina, Tennessee, Utah, Vermont, Virginia, Washington and Wisconsin. It is interesting, at least, to note the states not included in the registration area:—Alabama, Arkansas, Arizona, Georgia, Idaho, Iowa, Nevada, New Mexico, North Dakota, Oklahoma, South Dakota, Texas, West Virginia and Wyoming. The results obtained from a study of the reports from such an extensive district must be looked upon as thoroughly representative of the country at large. The last complete statistics available are those for 1920. Influenza was still an important factor at that time, it being responsible for a death rate of 71 per 100,000. The influenza rate was 98.8 in 1919, 302.1 in 1918, 17.3 in 1917, 26.5 in 1916, 16 in 1915, 9.1 in 1914 and 10.3 in 1912. The important causes of death in 1920 were as follows: