Secrets of Nature was a British short black-and-white documentary film series, consisting of 144 films produced between 1922 and 1933 by British Instructional Films, which filmmaker, historian and critic Paul Rotha described in 1930 as "the sheet anchor of the British film industry".[1][2] A second series of films from the same team, under the title Secrets of Life and backed by Gaumont-British, followed between 1934 and 1947.[3]