The purpose of this book is to bring to students of aromatherapy and beauty therapy a foundation of knowledge of the composition and physicochemical properties of essential oils which may be used as a basis for further study. The book is addressed also to practising aromatherapists and beauticians and to retailers of essential oils seeking to extend their knowledge into the areas of essential oil composition and perfumery, to students in the sixth forms of schools and in college and university, to 1life-long students whose thirst for knowledge can never be wholly satisfied, and to those who find hope for the future and solace in the study of subjects of unlimited interest and practical value.