<P> After the 1880s, a eugenics movement developed on ideas of biological inheritance, and for scientific justification of their ideas appealed to some concepts of Darwinism . In Britain, most shared Darwin's cautious views on voluntary improvement and sought to encourage those with good traits in "positive eugenics". During the "Eclipse of Darwinism", a scientific foundation for eugenics was provided by Mendelian genetics . Negative eugenics to remove the "feebleminded" were popular in America, Canada and Australia, and eugenics in the United States introduced compulsory sterilization laws, followed by several other countries . Subsequently, Nazi eugenics brought the field into disrepute . </P> <P> The term "Social Darwinism" was used infrequently from around the 1890s, but became popular as a derogatory term in the 1940s when used by Richard Hofstadter to attack the laissez - faire conservatism of those like William Graham Sumner who opposed reform and socialism . Since then, it has been used as a term of abuse by those opposed to what they think are the moral consequences of evolution . </P> <P> Darwin was a prolific writer . Even without publication of his works on evolution, he would have had a considerable reputation as the author of The Voyage of the Beagle, as a geologist who had published extensively on South America and had solved the puzzle of the formation of coral atolls, and as a biologist who had published the definitive work on barnacles . While On the Origin of Species dominates perceptions of his work, The Descent of Man and The Expression of the Emotions in Man and Animals had considerable impact, and his books on plants including The Power of Movement in Plants were innovative studies of great importance, as was his final work on The Formation of Vegetable Mould through the Action of Worms . </P>

What is the name of the famous book written by charles darwin
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