About the editor WERNER STUMM is Professor and Head of the Institute for Water Resources and Water Pollution Control associated with the Swiss Federal Institute of Technology in Zurich, Switzerland. He received the Tyler Prize for Environmental Achievement, the Albert Einstein World Award of Science, the Monsanto Prize for Pollution Control, and has been awarded numerous international honorary degrees. He is the author of Aquatic Chemistry and Gewasser als Okosysteme, and has edited four other books. Dr. Stumm received his PhD in chemistry from the University of Zurich; he was a professor of applied chemistry at Harvard University until 1970.