Liverpool shipowners have played prominent parts in the long struggles for supremacy on the North Atlantic between the more notable steamship companies, such as the Cunard, White Star, Collins, Inman, Guion, Hamburg-Amerika, and Norddeutscher Lloyd Lines, and associated with their names are those of the celebrated engineers and shipbuilders who were responsible for building the transatlantic mail steamers. An historical account is given of the evolution of the mail service from its commencement in the year 1710 to the present day, and includes the British Government Post Office Packet service commenced in 1710 by the sailing packet brig Royal Anne, the inauguration in 1816 by the Black Ball Company of the first regular sailing packet line, the commencement of the Atlantic Ferry in 1840 by the Cunard Line, and the evolution of the mail steamer to its present size, as represented by the liner No. 534 now building. This period covers the development from wood to iron, and iron to steel, for the construction of hulls, the change from sail to steam, from paddles to single, twin, triple, and quadruple screw propellers, from simple to compound, triple-, and quadruple-expansion reciprocating engines, the development of the Parsons direct and single- and double-reduction geared turbines, the change from tank boilers to low- and high-pressure water-tube boilers, and the evolution of passenger accommodation to its present standard. A few observations are made on the navigation and propulsion of modern liners. Tables show the record passages of Atlantic liners and dimensions of the present-day big ships. The state-rooms, lounges, ballrooms, cinema theatres, swimming baths, sports decks, and dining saloons in the modern liner are briefly described. The author thinks it is improbable that the Atlantic steam ferry will be supplanted by an air ferry, and he gives an account of the competition with foreign lines which receive subsidies for shipbuilding and operation, and explains the reasons for building No. 534, and the part which Liverpool and the Atlantic Ferry might play in the future development of the United States of America and the Dominion of Canada.