The Physiological Basis of Mental Activity

chief tools to be used in understanding national health problems, and in devising answers to the problems, they are not useful alone. They need to be complemented by appreciation of the social, moral, and political influences on health thinking that are themselves as important to public health as increasing incidences of chronic diseases and costs of care. By merely gathering their earlier individual articles in Progress in Health Services and failing to support them with comprehensive discussion, the authors have neglected their own observation: Neither mortality nor morbidity occurs in a vacuum; both take place in human populations.