It is not essential now to state what mechanical improvements this change involved further than to say that previous to this date the cabin quarters in sailing-vessels and steamships, both naval and mercantile, were located in the after-part of the ship, and this for the reason that it enabled the passengers to fully occupy that part of the ship which was not invaded by the crew for working purposes. The year 1870, therefore, marks an epoch in steam navigation, and the vessels of all the principal lines, built since that date have been conformed to the model set by the Oceanic, and the best ships of to-day are so arranged that the passengers who pay the highest rates are located in all their necessary movements in the central part of the vessel. From year to year the speed has been improved, until so many steamships are classed as racers that the rivalry has come to be centred in appointments and luxurious accommodation. The inauguration of the Oceanic Company marked the beginning of what may be called the second epoch in transatlantic travel, and with the first voyage of the City of New York a third epoch was begun. This last period, into which we have hardly entered, is distinguished by the twin-screw steamship. There are now nine great vessels of this class in the passenger service between European ports and New York: the City of New York and the City of Paris, of the Inman line; the Majestic and the Teutonic, of the White Star line; the Augusta Victoria, the Columbia, the Normannia, and the Fürst Bismarck, of the Hamburg-American line; and La Touraine of the French line. These new vessels are not remarkably superior to the best single-screw steamships in the matter of speed, and any advantage gained in this respect may be attributed to their having greater horse-power. As may be seen from the record of fast passages, the Etruria and the Umbria, of the Cunard line, are not only very close seconds to the best twin-screw ships, but are even ahead of several of the new type of vessel. The great merit of the twin-screw ship lies in the increased safety which its mechanism insures. It admits of avoiding obstacles that would surely wreck a single-screw vessel, of better handling in case of collision, and of surer progress in the event of the breaking of a shaft.