Material concerning two lectures by Airy on magnetism delivered at South Kensington and Greenwich, with some additional papers. The papers include Airy's previous lecture of 1865, on magnetical error of compasses in iron ships; preparations for the South Kensington lectures; and correspondence with W.E. Forster on times of sunsets, possibly in relation to the Forster Elementary Education Act, 1870. There is also correspondence with H. Lloyd, C.W. Merrifield, J. Glaisher, J. Challis, R. Hall, A.C. Key and G.G. Stokes.