The William of Moerbeke Translation Series, under the general editorship of Stuart D. Warner, is devoted to publishing translations of important works - ancient, medieval, and modern - regardless of the original language, in every area of scholarly endeavor, including philosophy, political science, theology, literature, history, economics, and law. The aim of the series is to bring the reader as close as possible to the letter and spirit of the original work. Each volume will contain a scholarly introduction and notes. We welcome all inquiries and suggestions. Physics, Or Natural Healing is the first volume of this series.