This classic toxicology textbook, considered the seminal reference for those working in the field, now in its fifth edition, has added many new prominent names to its refreshed list of several dozen eminent contributors. Continuing to provide an unparalleled exploration of the field, A. Wallace Hayes, Secretary-General of the International Union of Toxicology, has solicited seven new chapters for this edition of the "Principles and Methods of Toxicology" providing toxicology-relevant information on omenics, pathology, plant and animal poisons, non-animal research, and necrosis and apoptosis. He also adds an extensive listing of information resources.