Correspondence and observations of tides, including records of daily levels of tides; tide graphs; heights of high water marks; meteorological records; and notes taken daily at various coastal stations, including Deptford, Bristol, Southampton, Ipswich, Limerick and Dublin, tabulated and reduced, and often plotted on line graphs. There is also a coloured plan of a tide meter; C. Hopkin's hints and suggestions for a new theory of tides; J. Maxton's description of a self-registering tide-gauge; charts of high and low tides, including the River Tees estuary and at Ipswich; W. Whewell's tidal observations and theories; tidal observations at Petropaulousk (sic); heights of high water at various centres; and meteorological records for tides in storm conditions. The correspondents include F. Beaufort, A. de Morgan, J.W. Lubbock, E. Sabine, J.C. Ross, W. Whewell, T. Colby, W.R. Hamilton, T. Larcom, L.A. Quetelet, T. Henderson and W.H. Smyth.