Incidence of common infections of childhood.

All three sources are limited, the first as to scope of diseases, the second as to time, and the third as to age coverage and degree of completeness in reporting (especially during the war years, 1939-45, which have been ignored). Mortality is referred to where the figures are of interest. The diseases studied are dealt with in the following order: chicken-pox, diphtheria, german measles (rubella), measles, mumps, whooping cough, scarlet fever. CHICKEN-POX.-A sample of hospital admissions in 1938 gave the figures in Table I for patients admitted with diseases other than chicken-pox.