Much of the work of preparing this book for publication was centered around making a representative selection from the clinical lectures given at Chestnut Lodge. There were over a million words in these 246 lecture-discussions, given over the period from October 1942 to April 1946. Only about 130,000 words have been included in this book, mostly material contained in lectures given between April and November 1943. The first 49 lectures cover, in general, the developmental approach to mental disorder and the psychiatric interview. The lectures from 100 through 246 include many brilliant discussions of particular problems in therapy, often growing out of actual clinical problems presented by the group. Within the main block of lectures making up this book-50 through 99-the major omissions have been part of the discussion of hysteria and the lectures on psychosomatic disorders.