The story of a young woman working to become a doctor at a time when medical schools did not admit women. Margaret Georgina Todd was one of the earliest British women to qualify in medicine, though she is best remembered as the person who coined the term “isotope”. She studied at the Edinburgh School of Medicine for Women, founded by Sophia Jex-Blake, later her life-partner. She wrote this book during her studies, and published it around the time she received her degree. She authored five other books, including a biography of Jex-Blake.