Correspondence and printed papers on astrology, chemistry, electricity, galvanism, geology and optics. The correspondents include A. de Morgan, F. Faraday, C.V. Walker, J.V. Lamont, Lord Wrottesley, W.H. Preece, H. Lloyd, C.F. Varley, P.A. Secchi, J.P. Gassiot, B. Stewart, W. Siemens, E.W. Brayley, A. Sedgwick, J. Gillis, W. De La Rue, B.C. Brodie, J.T. Chance, H.E. Roscoe, G.G. Stokes, T. Belt, L. Horner, W. Bowman, J.F.W. Herschel and A.S. Herschel. There is a printed paper on earth currents; observations and reductions of earth currents and diagrams comparing the results with magnetism; a newspaper cutting on telegraphic communication with Europe; a newspaper cutting, in Italian, on Gladstone's electric light; a printed paper on the transit-velocity of waves through rock formations; a page extracted from 'The London Review' on the Wenham Binocular Microscope; a printed paper on a hemispherical condenser for the microscope; extracts from 'The London Review' on light spectra; a printed paper on the history of lighthouse illuminations; and a printed paper on the iris seen in water.