Miscellaneous scientific correspondence and papers, including correspondence on the tensile strength of metals; A.R. Clarke on the elasticity of brass; W. De La Rue on the stratified discharge of electricity; drawings of electrical appliances; a paper titled 'the Great Lighting Inductorium'; R. Owen's paper on fossil reptilia of South Africa; a paper by the Eastbourne Natural History Society 'on the sinking of the South Coast of England'; W. Ackland's views on the training of opticians; trials of Navy telescopes; a piece from 'Public Opinion' on spectrum apparatus from Potsdam Observatory; J. Hogg's 'on the measurement of the angular aperture of object-glasses'; 'McClear's new star spectroscope'; P.A. Secchi's draft results of observations of solar activity and protuberances, 1875; W. De La Rue's 'Auxiliary tables for determining the angle of position of the Sun's axis and the latitude and longitude of the Earth'; and a photograph of 'Surirella gemma at magnitude 1040'. The correspondents include W.H.M. Christie, W. Spottiswoode, W. Huggins, C. Brooke, J.T. Chance, W. De La Rue, W. Siemens, W. Crookes, R. Owen, C.V. Walker and J. Tyndall.