Here is a shortened English-language edition of Philippe Mailhebiau's monumental La Nouvelle Aromatherapie: caracteroloigie des essences et temperaments humains. The keystone of this book is in the 24 monographs of major essential oils, presenting each oil as an individual entity with detailed and precise characteristics. An understanding of the personality profile of an essential oil makes it possible to relate its olfactory affinities to the Individual. From a therapeutic point of view this approach opens the door to personalized treatments that go beyond the scope of symptomatic Aromatherapy; combining efficient physicochemical action with a decisive psychosensory effect.