 This also meant that operations were largely restricted to amputations and external growth removals.Beginning in the 1840s, surgery began to change dramatically in character with the discovery of effective and practical anaesthetic chemicals such as ether, first used by the American surgeon Crawford Long (1815–1878), and chloroform, discovered by James Young Simpson (1811–1870) and later pioneered in England by John Snow (1813–1858), physician to Queen Victoria, who in 1853 administered chloroform to her during childbirth, and in 1854 disproved the miasma theory of contagion by tracing a cholera outbreak in London to an infected water pump.In addition to relieving patient suffering, anaesthesia allowed more intricate operations in the internal regions of the human body.