Scottish geologist. Uniformitarian geologist whose Principles of geology (1830–3), Elements of geology (1838), and Antiquity of man (1863) appeared in many editions. Professor of geology, King’s College, London, 1831. President of the Geological Society of London, 1835–7 and 1849–51; of the British Association for the Advancement of Science, 1864. Travelled widely and published accounts of his trips to the United States. CD’s scientific mentor and friend. Knighted, 1848; created baronet, 1864. FRS 1826.