Volume 4 of Contemporary Nephrology summarizes major advances in 16 different areas of nephrology during the years 1985 and 1986. Major changes in the composition of the Editorial Board and authorship of the different chapters have occurred in this volume. Six distinguished contributors have retired from the Editorial Board. They include Dr. Zalman A. Agus, Philadelphia; Dr. Robert Anderson, Denver; Dr. Eli Friedman, Brooklyn; Dr. Richard Glassock, Torrance, California; Dr. James Schafer, Birmingham, Alabama; and Dr. Gordon Williams, Bos­ ton. We are grateful to them for their outstanding contributions to the of this series and for their advice and suggestions as first three volumes members of the Editorial Board. They certainly deserve substantial credit for the success of this series. Seven outstanding academicians have joined the Board. They in­ clude Dr. Vito M. Campese, Professor of Medicine at the University of Southern California, who contributed the chapter on "Recent Advances in the Role of the Renal Nervous System and Renin in Hypertension"; Dr. William G. Couser, Professor of Medicine and Head of the Division of Nephrology at the University of Washington in Seattle ("Immunologic Aspects of Renal Disease"); Dr. Garabed Eknoyan, Professor of Medicine and Vice Chairman of the Department of Medicine at Baylor College of Medicine ("The Uremic Syndrome"); Dr. H. David Humes, Associate Professor of Medicine and Chief of the Nephrology Section at the Uni­ versity of Michigan Medical School, Veterans Administration Medical Center ("Acute Renal Failure and Toxic Nephropathy"); Dr.