Since 1994, the Phytochemical Society of North America has devoted its annual symposia to topics with biological perspectives. Our last four volumes have dealt with medicinal plants (1994), plant/insect interactions (1995), food phytochemicals (1996), and plant/microbe interactions (1997), respectively. The Symposium held in Pullman, Washington, July 26-31, 1998 brought many aspects of these previous symposia once again to the forefront. This time, however, there was greater emphasis on the potential applications of phytochemistry to the diverse topics of human health and nutrition and plant defense. As we learned about innovative uses of molecular biology as it is being applied to these topics, we were reminded once again of the biochemical th foundation on which these advances rest. On the occasion of the 75 birthday of G.H. Neal Towers, which we were privileged to celebrate, a perspective of where we began and how far we have advanced was made patently real for those in attendance. The papers assembled in this volume were presented during the Sympo- sium. Roughly grouped under three broad topics, they include: I. Drug Discov- ery and Pathway Engineering toward New MedicinallNutriceutical Targets (papers by Cragg, Croteau, Thompson, Costa, McLaughlin, Dixon, and Matern), 2. Roles for Polyphenols-Biosynthesis and Applications (Gross, Hillis, Haslam, and Ferreira), 3. New Chemical Prospects and Plant Defense (Asakawa, Selmar, Houghton, and Mizutani).