This book contains in-depth detail on the characteristics, chemistry, sourcing and application of essential oils. It covers the effects of odours on mind, body and emotions. It provides tutors with an ideal support text for any advanced-level aromatherapy course. It covers the recent National Occupational Standards. It provides a clear focus on clinical and professional aromatherapy making it suitable for any qualification associated with the International Federation of Professional Aromatherapists (IFPA).