Winston Churchill's addree as Home Secretary to Prime Minister Asquith on compulsory sterilization of 'the feeble-minded and insane', as quoted in "'Race', Sport and British Society" edited by Ben Carrington and Ian Mcdonald, 2001.
Erasmus Darwin (1807). “The Botanic Garden: A Poem, in Two Parts: Part I. Containing The Economy of Vegetation. Part II. The Loves of the Plants”, p.22