Colleagues and friends of Dan Yaron submitted the following tributes. While each submission comes from an individual who knew Dan in a very different way, they all remark on his immeasurable contributions to the field of agricultural eco nomics, his unique approach, which combines his training and experience with his scientific background, and the admirable professionalism and civility that was apparent in every project he undertook. His work, initially inspired by the chal lenge of farmers in the arid Negev, eventually took him to the United States to work with universities and to serve on commissions furnishing his research with global applicability. Dan is not only admired for his enormous contributions to the vast body of research available in his field, but also for the commitment and dedi cation he epitomized. He will be greatly missed by those of us who were fortunate enough to make his acquaintance. ELIFEINERMAN The Hebrew University of Jerusalem, Rehovot, Israel Dan Yaron, my teacher and mentor of blessed memory, was a man of wisdom, thought, counsel and deeds. His many talents, his endless energy and his ambition led him to blaze new trails in research, to ask the relevant questions while separat ing the wheat from the chaff, and to answer them while mastering the most ad vanced scientific analyses.

Water Renovation and Reuse focuses on the general principles and technological developments of water reuse and renovation. This book provides documented case studies of reuse practices and experiences throughout the world. Organized into two parts encompassing 15 chapters, this book starts with an overview of the different aspects of the problem to conserve, reuse, and recycle the limited water resources. This text proceeds to discuss the initial phase of water renovation and reuse, which is based on the conservationists' concept that society's wastes should be utilized and conserved to preserve the fertility of the soil. Other chapters explore the second phase of water renovation and reuse, which is motivated by the need to conserve and reuse water in arid areas. This book discusses as well the policy of zero pollution in the United States, which led to programs of land disposal. This book is intended for biologists, engineers, chemists, agronomists, public health officers, and water resources authorities.