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Wallace was born in Usk, Monmouthshire now part of Gwent, Wales. He travelled and collected plant samples in the Amazon basin in association with Henry Walter Bates (1825-1892) and later in the Malay Archipelago and the Spice Islands (1854-62). Wallace influenced by Malthus' Essay on the Principle of Population propounded a theory of the evolutionary origin of species by natural selection with notice to Darwin. Darwin consulted with geologist Sir Charles Lyell (1797-1875) and botanist Sir Joseph Hooker (1817-1911) and agreed that there should be a public presentation of his own and Wallace's potentially dramatic and controversial views.