Correspondence and printed papers on chronology, geography and tides. The correspondents include J.R. Hind, R.A. Proctor, W.H. Smith, J.W. Bosanquet, W. Thomson, C.T. Beke, E. Guest, A. de Morgan, J.N. Blakesley, W.H. Miller, H.E. Stanley, F. Struve, H.W. Bates, C.E. Delaunay, F. Galton, E.J. Routh, J. Challis, A. d'Abbadie, W.H.F. Talbot, H. James, J.S. Russell, T.A.B. Spratt, H.J. Rose, R. Ellis and G.T. Clark. There are papers and maps relating to ancient eclipses; a set of rules for determining Easter Day; a perpetual calendar; papers and maps on the position of Gesoriacum; papers and newspaper cuttings on the Welsh Nation; a waterways map of France and part of Western Europe; a plot of estimates for the Ordinance Survey one-inch map; a paper by Airy on 'The Inundation of Visp'; a printed paper on tides in a rotating globe covered by a sea of constant depth; a printed paper on 'the effects of tides on planetary motion'; and other printed papers on tides.