Miscellaneous correspondence regarding new inventions and engineering works, including a paper by W.B. Burden on propellers and experiments to discover resistance to propellers; George Rennie's work on the heat of water in contact with a propeller; the 'Journal of the Society of Arts', including pieces on the (i) feasibility of carriage by steam vessel, (ii) tonnage registration, and (iii) mercantile steam transport economy; a report of the committee on shipping statistics; the sea trials of S.S. 'Persia'; 'Considerations on steam vessels' by C.R. Moorsom; an article on American submarines from the 'Mechanics' Magazine'; oscillations of a ship on a wave by W. Bell; observations of the Permanent Way Company; and interpolation tables used by the Nautical Almanac Office. There is also material relating to patents for a gas purifier; safety gear for steam boilers; Seutz's calculating machine; the launch of I.K. Brunel's 'Leviathan'; and notices, awards and W. Cubitt's presidential address to the Institution of Civil Engineers. The correspondents include, among others, Earl Hardwicke, I.K. Brunel, H. Douglas, C.R. Moorsom, C.B. Vignoles, J.R. Hind, W. Farr, C.E. Trevelyan and C.V. Walker.