ACCORDING to provisional data for 1939 compiled by the Public Health Service of the United States the general mortality in 45 States, the Districts of Columbia, Hawaii and Alaska, was 10.7 per 1,000 Inhabitants, as compared with 10.6 in 1938. Infantile mortality was 48 per 1,000 living births, the lowest hitherto recorded. The fall in maternal mortality continued, being 10 per cent lower than in 1938 (4 per cent live births). During the year 1939 no case of cholera or yellow fever was reported, but one case of plague was notified in the State of Utah. There were 403,037 cases of measles, or less than half the number in 1938, and 9,877 cases of smallpox as compared with 14,938 in the previous year. At the beginning of the summer of 1939 there was an outbreak of poliomyelitis in the States of the Atlantic coast with a total of 7,339 cases compared with 1,705 in 1938. The incidence of diphtheria, cerebrospinal fever, scarlet fever, typhoid and paratyphoid fevers was much less than the average for the quinquennium 1934-38. There was an outbreak of influenza in February 1939 which subsided towards the middle of July, but there was another outbreak in October which lasted until June 1940 ; in 1939 there were 275,503 cases notified, or more than double those in 1938 and 40 per cent above the average for the quinquennium 1934-38. 2,996 cases of typhoid fever were notified in 1939 as compared with 2,294 in 1938. The mortality from typhoid, paratyphoid, measles, scarlet fever, diphtheria, encephalitis, meningitis, tuberculosis, malaria, pellagra, affections of the alimentary tract, syphilis, diarrhoea and enteritis in children under two years, and accidents (including motor accidents) were the lowest reported in the last five years. The mortality from pneumonia was very low in 1939, the diminution being more than 33 per cent compared with 1938. The increases in the mortality from cancer, diabetes, cerebral hæmorrhage and heart disease must be attributed principally to the greater age of the population.