Correspondence and papers on magnetic disturbances, experiments and findings on magnetism, magnetic deviations and observations of magnetic phenomena. There are German circulars on magnetism by K.F. Gauss and W.E. Weber; tracings and description of the proposed magnetic observatory at Dublin; a magnetic chart of Scotland, 1836; observations of shifts in the magnetic and dipping needle; notices of magnetic disturbances; readings from the horizontal circle of the magnetic theodolite, the horizontal force magnetometer and the horizontal force magnet; formulae for the reduction of magnetic observations; a report by H. Breen on theodolite readings; papers on inspections of magnetic equipment; and the 'Magnetic and meteorologic observatory at Bombay', from the 'Bombay Times'. The correspondents include C. Babbage, F. Baily, F. Beaufort, M. Faraday, J.D. Forbes, J.F.W. Herschel, F.W.H.A.V. Humboldt, T. Jones, H. Lloyd, E. Moor, L.A. Quetelet, F. Ronalds, E. Sabine, T.G. Taylor, W.E. Weber, W. Whewell, S.H. Christie, J. Glaisher and W.H. Sykes.