Thomas Robert Malthus
Margaret is the "lady, the wonder of her kind, whose form was up born by a lovely mind" whom Shelley celebrates in his poem "The Sensitive Plant", and she helped kindle "a new-found sense of radicalism". Tighe encouraged Shelley in his reading of [[Humphry Davy]] and [[Thomas Robert Malthus|Thomas Malthus]]. Their association ended when, in July 1822, Percy Shelley drowned in a storm in the Gulf of La Spezia and Mary Shelley returned to England.