Miscellaneous correspondence and papers regarding engineering and new inventions. The correspondents include E.J. Routh, M. Bouch, W. De La Rue and L.C.W. Merrifield. Many of the papers are printed, and are in the form of notices of meetings, pamphlets and circulars. There are also several papers relating to the Institution of Civil Engineers. The subjects covered include HMS 'Inflexible'; the utilisation of sewage and purification of rivers; Hooper's Indian-rubber core for telegraph cables; Aberdeen Harbour, with a watercolour drawing and a map; animal mechanics; various bridges; and collisions at sea. There is also a paper by Airy on D'Alembert's Principle.