The papers in this book are the majority of those that were presented at the Sixth International Symposium of Poisonous Plants (ISOPP6) held in Glasgow, Scotland, August 2001. The papers have been subjected to refereeing and editing. The editors are grateful to the referees and to the authors, who responded in a timely manner in the format requested. Although the refereeing process has delayed publication we hope that the changes made will help make the volume accessible to the more general reader. Due to limitations of space, some submissions have been shortened considerably. We hope that the resulting loss of content does not detract from the authors' intended message. Where animal studies were conducted, authors are responsible for meeting the ethical and legal requirements of their institutes and countries. A number have made explicit statements in this regard.