Donald McD. Foubister practised homoeopathy from 1937 until his death in 1988. During his retirement he gave tutorials on this subject to many doctors from Britain and overseas. This book reflects the content of those tutorials, and the author's vast experience in the field. Originally appointed as house physician at the Royal London Homoeopathic Hospital, Foubister went on to serve as a medical officer during World War II, where he practised homoeopathy despite official disapproval. In 1946 he was assistant physician in the Children's Department of the Royal London Homoeopathic Hospital, and in 1955 was admitted as a Fellow in the Faculty of Homoeopathy. He was elected President of the Faculty of Homoeopathy from 1970 to 1972.