Scope and Contents Correspondence and papers on magnetic disturbances, alleged new discoveries and theories, and experiments on magnetism. There are calculations for the mean declination of Greenwich, 1849; C. Hansteen's extensive magnetic observations at Christiana (Oslo), and a French paper by him on terrestrial magnetism; E. Sabine's remarks on W. De La Rue's diurnal magnetic theories; an unsigned manuscript on the magnetic disturbances of 24 September 1847 at the Royal Observatory; observations of...