Correspondence and printed papers on chronology, geography and tides. The correspondents include J.R. Hind, A. Way, J. Washington, W.H. Smyth, E. Cardwell, C.A. Young, J. Thompson, R. Fitzroy, P.S. Stanhope, A. Cayley, W. Spottiswoode, R.I. Murchison, G. Everest, W. Selwyn, J.D. Forbes, J.H. Speke, G. Grote and T. Cooke. There are calculations of ancient eclipses; a printed paper by P.A. Hansen on secular variation of the mean longitude of the Moon; papers and a tracing relating to Airy's paper on Caesar's Landing; a printed letter from C.T. Beke on the discoverer of the source of the Nile; a printed circular by A. d'Abbadie on Upper Ethiopian Geodesy; a paper by Airy 'on the effect of the Sun and Moon in producing a compound tide consisting of a semidiurnal and a diurnal tide'; newspaper cuttings on conservancy of the River Mersey; and a paper by Thomas Carrick titled 'Note on the tides and the earth's rotation'.