Jane Marcet (née Haldimand) (1 January 1769 – 28 June 1858) was an English salonnière of Swiss origin, and an innovative writer of popular, explanatory science books. She also broke ground with Conversations on Political Economy (1816), which explain the ideas of Adam Smith, Malthus and David Ricardo. Life Jane Marcet was born in London on 1 January 1769, one of twelve children of a wealthy Genevan merchant and banker, Anthony Francis Haldimand (1740/41–1817), and his wife Jane (died 1785). She was educated at home with her brothers. Her studies included Latin (essential for the sciences), chemistry, biology and history, and topics more usual for young ladies in England. Jane took over the running of the family at age 15, after her mother's death. She managed the house and helped to bring up her younger siblings. Her younger brother William Haldimand (1784–1862) became a director of the Bank of England and a member of Parliament. She also acted as her father's hostess, helping to entertain frequent parties of scientific and literary guests. Jane developed an early interest in painting during a visit to Italy with her father in 1796, and studied with Joshua Reynolds and Thomas Lawrence. Her artistic training later enabled her to illustrate her books. Jane was married in 1799 to Alexander John Gaspard Marcet (1770–1822), a political exile from Geneva, Switzerland who graduated from medical school at the University of Edinburgh as a physician in 1797. After their marriage, the Marcets continued to live in London. They had four children, one of whom, François Marcet (1803–1883), became a well-known physicist. Alexander was strongly interested in chemistry, and became a lecturer at Guy's Hospital in London and a Fellow of the Royal Society. When Jane became interested in learning more about chemistry, they conducted experiments together in a home laboratory, discussing the scientific principles involved. The Marcets belonged in a literary and scientific social circle of leading writers and scientists, such as Mary Somerville, Henry Hallam, Harriet Martineau, Auguste Arthur de la Rive and Maria Edgeworth. Novelist Maria Edgeworth described their home in her letters, with lively, intelligent children and a welcome for visitors. One Edgeworth anecdote gives a vivid picture of the Marcet family and its scientific and social activities: "We came here last Friday, and have spent our time most happily with our excellent friend Mrs. Marcet. His children are all so fond of Dr. Marcet,