Abnormality, as Hippocrates suggested centuries ago, is essentially a matter of defect or of exaggeration, and so the line between what is normal behavior and what is abnormal behavior is a thin, shifting one.  In the study of the range of human variability lies a key to sympathetic understanding of those who suffer the tragedy of a sick, disturbed mind. In such study, too, lies a key to a greater capacity to understand one’s own emotional and social growth and thus to cope more skillfully with the endless problems, crises, and frustrations of everyday living.  In this book, eminent authorities, using non-technical language, introduce the layman to the scope and the new horizons of abnormal psychology.