This revised & expanded handbook is an in-depth guide to essential oils providing a research-based overview of the field of aromatherapy. It looks at the essential oils used in contemporary aromatherapy practice with an emphasis on the underlying philosophical approaches & therapeutic applications. The book begins with an explanation of the theoretical history of aromatherapy in Greek Chinese & Ayurvedic medicine. It then gives a detailed account of how essential oils are created how & where aromatherapy is used the underlying pharmacology & the current research. The characteristics of over 100 essential oils absolutes & resinoids are explored including botanical & chemical information usage & combinations. This will be an indispensable text for all students & practitioners of aromatherapy & related disciplines as well as anyone interested in the use of essential oils for health & well-being.