Correspondence and papers on magnetic disturbances, magnetic observations, statistics and reductions, requests for data and matters arising from magnetic papers. There are papers concerning the disagreement between Airy and E. Sabine concerning the usefulness of Greenwich magnetic observations; an article in 'The Engineer' on meteorological observations at the Royal Observatory and a paper on early railways by S. Smiles; 'The relation of the Earth's magnetism to the rotation of the Sun' by C. Hornstein, with magnetic inequalities for periods of 26 1/3 days; 'Computation of diurnal inequality of dip from diurnal inequality of horizontal force and vertical force magnets'; tables and curves of magnetic elements for the period 1858 to 1870; R. Wolf's solar spots and their relationship with magnetism; requests for E. Halley's magnetic chart; a report on magnetism by the Kew Committee for 1869-1870; variations of the compass, 1872; J. Bagg's theory of diurnal magnetism; P.A. Secchi on sunburst activity and magnetic disturbance; H. Lloyd's magnetic curves; a method for determining the induction co-efficient of a magnet; and a new magnetic theory by Omega (G. Fowler). The correspondents include J. Glaisher, A. Strange, C. Brooke, G.H. Richards, W. De La Rue, O. Struve, A.V. Auwers, J.W. Jones, F.J.O. Evans, J. Challis, A.A. De La Rive, G.A. Erman, J.F.W. Herschel, W.H. Miller, W.H. Smyth, B. Stewart, G.G. Stokes, W.H.M. Christie and J.K.F. Zöllner.