In addition to his work at his father's bank, Lubbock took a keen interest in archaeology and evolutionary theory. In 1855, he and Charles Kingsley discovered the skull of a musk ox in a gravel pit, a discovery that was commended by Darwin. A collection of Iron Age antiquities Lubbock and Sir John Evans excavated at the site of Hallstatt in Austria is now in the British Museum's collection. He spoke in support of the evolutionist Thomas Henry Huxley at the famous 1860 Oxford evolution debate. During the 1860s, he published many articles in which he used archaeological evidence to support Darwin's theory. In 1864, he became one of the founding members (along with Thomas Henry Huxley and others) of the elite X Club, a dining club composed of nine gentlemen to promote the theories of natural selection and academic liberalism. He held a number of influential academic positions, including President of the Ethnological Society from 1864 to 1865, Vice-President of Linnean Society in 1865, and President of the International Congress of Prehistoric Archaeology in 1868. In 1865 he published "Pre-Historic Times", which became a standard archaeology textbook for the remainder of the century, with the seventh and final edition published in 1913.