Correspondence and papers on various academic works, including W.H. Stevenson's thoughts on hydrogen, gas and water; E.W. Brayley's injury to book bindings by gas; and R.S. Poole's places of the sun and moon's longitude in regard to ancient Egyptian chronology. There are papers by F. Coxworthy on the influence of electricity in regard to various scientific phenomena; M. Faraday's galvanic experiments; Airy's essays on the route of the Israelites during the Exodus; a small map of North Canada associated with J. Franklin's last expedition; various comments on tides, with a register of tides on the River Thames for June-July 1849; a small history of high tides on the Thames, 1092-1841; and reports of the Council of the Royal Irish Academy. The correspondents include A. de Morgan, G.G. Stokes (on the phenomena of haloes), B. Powell, W. Whewell, J. Glaisher, J.D. Forbes and H. Lloyd.