A series of public lectures examines the development, organization, and challenges of preventive medicine and health administration, drawing on British experience for American audiences. Topics include fifty years of urban public-health progress, the roles of local and central authorities, lay and professional workers, sanitation, epidemiology, vital statistics, and the relationship between insurance, sickness provision, and socialized medical services. The addresses assess hospitals, maternal and child welfare, tuberculosis, venereal disease, influenza, and nursing training, identify policy mistakes and structural impediments, and advocate stronger preventive programs, stable professional tenure, and integration of insurance with measures that directly reduce illness.