Sir Joseph Hooker (1817-1911) was one of the greatest British botanists and explorers of the nineteenth century. He succeeded his father, Sir William Jackson Hooker, as Director of the Royal Botanic Gardens, Kew, and was a close friend and supporter of Charles Darwin. His journey to the Himalayas and India, during which he collected some 7,000 species, was undertaken between 1847 and 1851 to increase the Kew collections; his account of the expedition...