James Lind discovers citrus fruits prevent scurvy - 1747, James Blundell performs first blood transfusion - 1818, Humphrey Davy uses nitrous oxide as an anaesthetic - 1800, Edward Jenner develops a vaccine for smallpox - 1796, Louis Pasteur develops germ theory - 1870, Felix Hoffman patents aspirin, still the world's most popular medicine - 1889, Florence Nightingale goes to the Crimea - 1854, William Harvey discovers circulation - 1628, Gabriel Fahrenheit invents the mercury thermometer - 1714,

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