|Born||20 August 1883|
|Died||15 October 1972|
|Known for||Eugenics activism|
|Board member of||Board of Control for Lunacy and Mental Deficiency|
William Rees-Thomas (m. 1948)
In 1932 she was appointed to the Brock Committee (a Parliamentary committee chaired by Sir Laurence Brock) that produced the Brock Report that called for the forced sterilisation of "mental defectives".
Darwin was the middle child and elder daughter of Sir Horace Darwin, through whom she was a granddaughter of the naturalist Charles Darwin (she was born a year after Charles's death in 1882). Her mother, The Hon. Ida Farrer (1854–1946), was the daughter of Thomas Farrer, 1st Baron Farrer. Her younger sister Nora, later became Lady Barlow after marrying Sir Alan Barlow, 2nd Baronet, while her elder brother Erasmus was killed during the Second Battle of Ypres in 1915
- Burke's Landed Gentry: Darwin, formerly of Downe http://www.burkespeerage.com/FamilyHomepage.aspx?FID=3423
- ‘DARWIN, Ruth Frances’, Who Was Who, A & C Black, an imprint of Bloomsbury Publishing plc, 1920–2008; online edn, Oxford University Press, Dec 2007 accessed 27 Dec 2012
- The Times, Tuesday, Apr 19, 1921; pg. 4; Issue 42698; col F
- The Times, Thursday, Sep 15, 1949; pg. 7; Issue 51487; col D
- Not to be confused with the modern-day Charles Darwin Trust
- Daniel J. Kevles "In the Name of Eugenics: Genetics and the Uses of Human Heredity"
- House Of Commons The Times Friday, Jun 10, 1932; pg. 7; Issue 46156; col B
- Commonwealth War Graves Commission. Casualty details. Darwin, Erasmus. CWGC.org. Retrieved Sep 15, 2015.
- ‘REES-THOMAS, William’, Who Was Who, A & C Black, an imprint of Bloomsbury Publishing plc, 1920–2008; online edn, Oxford University Press, Dec 2007 accessed 27 Dec 2012
- Obituary: Mrs W. Rees-Thomas, The Times, Monday, Oct 16, 1972; pg. 14; Issue 58606; col F