I AM glad to take this opportunity to acknowledge the use I have made of a manuscript written by Mrs. Charlotte Wilson, Hon. Secretary of the Fabian Women's Group. The manuscript was founded on a lecture, entitled The Economic Disintegration of the Family, delivered by Mrs. Wilson to the Fabian Society in June, 1909. Not only ideas contained in the lecture, but also some of the wording of the manuscript, have been used in the last two chapters. I wish also to thank Dr. Ethel Bentham for the invaluable professional service rendered by her during the five years of the investigation.