Papers concerned principally with telegraphs and tests on Admiralty telescopes. The material on telegraphs includes tests and observations of deflections by C.F. Varley; a map of telegraph lines; a report on the South Australian telegraph; and a newspaper article on the Atlantic cable. The papers concerning Admiralty tests on telescopes include Airy's reports on his findings and correspondence with R.S. Dundas. Other material includes A. Sedgwick... writing on Darwin's Theory in 'The Cambridge Chronicle and Huntingdonshire Gazette'; annals of the meteorological observations at Mt Vesuvius; tests on eyesight; the construction of fluid lenses; T. Sutton's new 'Photographic Journal'; and a definition of fluorescence. The correspondents include C.R. Walker, J.C. Clark, J. Washington and W. De La Rue.