This book explores the origins of the American intelligence testing movement. It follows the life and work of Henry Herbert Goddard, America's first intelligence tester and author of the most popular American eugenics tract, The Kallikak Family. The book traces the controversies surrounding Goddard's efforts to bring Alfred Binet's tests of intelligence from France to America and to introduce them into the basic institutions of American life - from hospitals to classrooms to courtrooms. It shows how testers used their findings to address the most pressing social and political questions of their day, including poverty, crime, prostitution, alcoholism, immigration restriction, and military preparedness. It also explores the broader legacies of the testing movement by showing how Goddard's ideas helped to reshape the very meaning of mental retardation, special education, clinical psychology, and the 'normal' mind in ways that would be felt for the rest of the century.