Leonard Horner (1785-1864) was a prominent geologist, educator and, later, a factory inspector. In 1833 he was appointed to the Royal Commission on the employment of children in factories, and he inspected sites around the north of England. His earlier scientific work saw him elected a fellow of the Royal Society in 1813, and he was twice president of the Geological Society. The two-volume Memoir of Leonard Horner, edited by his daughter, Katharine...