Miscellaneous scientific works, including accounts of the Atlantic telegraph cable; reports on the trans-Australian telegraph line, with accounts from 'The South Australian Advertiser' and the plan of its route; proposals to connect the telegraph to Western Australia and Cape Borda; R. Mallet's paper on volcanic energy; a report of a committee to standardise electrical units; a photograph of Palmeira's seismograph; a catalogue of geological maps; the geology of Cumberland by J.C. Ward; C.X. Vaussenat's account of Pyrenean earth tremors; trials of navy telescopes; H. Hudson's 'the intensity of sound and light'; remarks on spectrum analysis by J.N. Lockyer; extracts from the 'British Journal of Photography'; papers on an improved Newtonian reflector; R. Airy's watercolours of light on calspar; and methods to find the quadrature of the circle. The correspondents include F. Ronalds, J.P. Cooke, S. Newcomb, G.J. Stoney, H. Draper, U.J.J. Le Verrier, C.M. Rutherford and W. Crookes.