An impressive amount of work, experimental, statistical and "observa­ tional" or "phenomenological" has been done in psychiatry during the past 30 to 40 years. Although Sullivan''s achievements have placed him in the first rank of psychiatry, some of the work done since he died in 1949 can be assimilated to enchance his achievements. For this reason, I enlisted the aid of Menachem Melinek, M.D., whose wide knowledge of re­ cent and contemporary psychiatric studies is admirably suited to the task of assimilating some of them to Sullivan''s theories. PATRICK MULLAHY Acknowledgments The authors wish to acknowledge with gratitude Mrs. Mari Hughes, formerly secretary, Department of Psychology, Manhattan College, for typing the original manuscript. Dr. Robert G. Kvarnes of the Washing­ ton School of Psychiatry, read the original manuscript and contributed several keen criticisms and suggestions for which we are grateful. We wish to express our thanks to the Department of Psychiatry, at Montefiore-North Central Bronx Hospitals for the support in preparing the final manuscript of the book. Robert Steinmuller, Director of Psychiatry at North Central Bronx Hospital was generous with his help. We would like as well to acknowledge the support of the Department of Psychiatry at Bronx-Lebanon Hospital Center and its Director of Psychiatry, Dr. Harvey Bluestone.