In his introduction the author points out that the relationship of the patient to the family is like that of the organ to the diseased body. The recognition of the patient as part of the family unit is particularly the concern of the medical social worker and the neuropsychiatric social worker. After discussing the family as a unit of illness and treatment, the author considers the special problems that have arisen in wartime and the possibilities for future research. The book is based on studies conducted cooperatively by the faculties of public health, medicine and psychiatry of Cornell University Medical College and the New York Hospital. In the current trend toward a social point of view in medical practice, this work establishes fundamental technics.