scientific career. From 1908, she and her brother looked into Mendelian genetics. Their 1915 publication was the first demonstration of genetic linkage in mammals. However, whilst she was a diploma student at the Society of Oxford Home Students (later St Anne's College, Oxford), the outbreak of the First World War changed her interest to nursing. Literary career Mitchison was a prolific writer of more than 90 books in her lifetime, across a multitude of styles and genres. These include historical novels such as her first novel The Conquered (1923), set in Gaul in the 1st century BCE, during the Gallic Wars of Julius Caesar, and her second novel Cloud Cuckoo Land (1925) set in 5th-century BCE Ancient Greece during the Peloponnesian War. Her best work is thought to be The Corn King and the Spring Queen (1931), which treats three different societies, including a wholly fictional one, and explores themes of sexuality that were daring in her day. Terri Windling called it "a lost classic". Literary critic Geoffrey Sadler stated of Mitchison's historical fiction: "On the basis of her early writings, she is unquestionably one of the great historical novelists." In 1932, Mitchison was commissioned by Victor Gollancz to edit a guide to the modern world for children. Mitchison's book, An Outline for Boys and Girls and Their Parents, included several distinguished contributors, including W. H. Auden, Richard Hughes, Gerald Heard, and Olaf Stapledon. On publication, An Outline was praised by The Times Literary Supplement, the New Statesman and the London Mercury. However, several clergymen, including the Archbishop of York, were angered by the book's lack of emphasis on Christianity, while other right-wing authors objected to a perceived sympathy with the Soviet Union. The Conservative writer Arnold Lunn wrote a lengthy attack on the book in the English Review, which contributed to its commercial failure. Undoubtedly her most controversial work, We Have Been Warned, was published in 1935, based on a journey to the Soviet Union. In it she explored sexual behaviour, including rape and abortion. The book was rejected by various publishers and ultimately censored. She approached first her friend Victor Gollancz, who flatly turned her down, observing that "publication of the book would cause a real outcry." The book was extensively rewritten to make it more acceptable to publishers, and was still subject to censorship. On publication it was universally despised for its depiction of rape, free love