David Livingstone (1813 -1873) was a Scottish Christian Congregationalist, pioneer medical missionary with the London Missionary Society, an explorer in Africa, and one of the most popular British heroes of the late-19th-century Victorian era. He had a mythical status that operated on a number of interconnected levels: Protestant missionary martyr, working-class "rags-to-riches" inspirational story, scientific investigator and explorer, imperial reformer, anti-slavery crusader, and advocate of commercial and colonial expansion. The British government agreed to fund Livingstone's Expedition to extend the knowledge already attained of the geography and mineral and agricultural resources of Eastern and Central Africa-to improve acquaintance with the inhabitants, and to endeavour to engage them to apply themselves to industrial pursuits and to the cultivation of their lands, with a view to the production of raw material to be exported to England in return for British manufactures; and it was hoped that, by encouraging the natives to occupy themselves in the development of the resources of the country, a considerable advance might be made towards the extinction of the slave-trade, as they would not be long in discovering that the former would eventually be a more certain source of profit than the latter. The expedition lasted from March 1858 until the middle of 1864. The expedition became the first to reach Lake Malawi and they explored it in a four-oared gig. In 1862, they returned to the coast to await the arrival of a steam boat specially designed to sail on Lake Malawi. Mary Livingstone arrived along with the boat. He eventually returned home in 1864 after the government ordered the recall of the expedition because of its increasing costs and failure to find a navigable route to the interior. The Zambezi Expedition was castigated as a failure in many newspapers of the time, and Livingstone experienced great difficulty in raising funds to further explore Africa. Nevertheless, John Kirk, Charles Meller, and Richard Thornton, the scientists appointed to work under Livingstone, did contribute large collections of botanical, ecological, geological, and ethnographic material to scientific Institutions in the United Kingdom.