A supplemental legal brief compiles medical, social, and statistical evidence to argue that access to birth-control information promotes individual and public welfare. It traces the history and international practice of birth control, examines population and birth-rate data, and surveys infant and maternal mortality, diseases aggravated by pregnancy, and harmful avoidance methods such as unsafe abortions. Subsequent chapters analyze links between prostitution, mental deficiency, venereal and other transmissible diseases, pauperism and child labor, and present comparative national experiences and expert opinions. The volume closes with a concise glossary and a conclusion urging legal reconsideration based on the assembled facts.