THERE is nowhere a finer collection of marine engineering models than in the Science Museum, South Kensington, and the collection also contains actual engines of great historical interest, including Symington's engine of 1788, the engine of the Comet of 1812 and the complete turbine installation of the Turbinia. The collection is therefore one which should be widely known. A catalogue of the engines and boilers and their accessories compiled by Mr. G. L. Overton, the keeper of the Water Transport Section of the Museum, was issued in 1926, and he has now written a handbook tracing their history and development (London: H.M. Stationery Office, 2s. net). In this, there are chapters on experimental and early marine propulsion, paddle engines, reciprocating steam screw engines, marine steam turbines, marine internal combustion engines, marine steam boilers and marine propellers. In such a work, it is, of course, only possible to trace the main lines of progress; but it may be safely said that anyone desirous of studying marine engineering history could not have a better foundation on which to build than this well-written and well-illustrated handbook. The book includes a list of the more important works on the subject to be found in the Science Library.