is the established authority in its field. It defines and describes more than 4500 terms and concepts, often at length, always clearly, and frequently with illustrations. Extensive cross-referencing leads to many aspects of a subject and to related topics. As a result gives a picture of current practice and theory in many fields and specialties.This thirty-sixth edition has been extensively revised, with many new topics added and many existing ones rewritten. New entries include Bowen's Disease, adulteration of food, cluster headaches and cyclical oedema of women. The sections on psychiatry, diseases of the ear, nose and throat, dermatology, ophthalmology and dentistry have been rewritten by experts in the particular fields. has proved itself invaluable to nurses and physiotherapists, to radiographers and medical secretaries, to medical students and practitioners, and to a wide variety of paramedical workers. It gives clear and practical advice and information which is both up-to-date and readily understood.