Theories of the Sun, Moon and planets, including investigations into and corrections of the semidiameters of the Sun, Moon and Venus; correspondence on the Moon's acceleration, with letters from J.C. Adams, C.E. Delaunay, P.A. Hansen, W. De La Rue, C. Pritchard and E.J. Routh; correspondence with C.E. Delaunay about the co-efficient of the principal time for expression of the Moon's latitude; correspondence on the transit of Venus, 1882, and the possibility of a transit of Mercury, 29 November 1606; a letter from M. Souillant on his theory of Jupiter's satellites; a letter from S. Newcomb asking for observations of Neptune to test his theory; sheets of calculations by Airy on perturbations; correspondence on H. Breen's planetary reductions; a printed sheet of H. Breen's results from the Madras planetary and lunar observations; correspondence on the opposition of Mars, 1862; and determinations of the solar parallax from F.A.T. Winnecke, U.J.J. Le Verrier, J.R. Hind, R. Pagsen, T. Maclear and R.L.J. Ellery.