There are few alterative agents so powerful and sure in their working as latitude and longitude; and as we slide across new degrees, habit, association, custom, and ideas slip one by one imperceptibly away from us; we come really into a new world, and if we had no hearts and no memories we should soon become different people. But the heart lives its own life, spinning gossamer threads that float away astern across time and space, joining us invisibly to that which made and fashioned us, and to which we hope to return. IV Wonderful, even for experienced travellers, is that first waking to a day on which there shall be no sight of the shore, and the first of several days of isolation in the world of a ship. There is a quality in the morning sunshine at sea as it streams into the ship and is reflected in the white paint and sparkling water of the bath-rooms, and in the breeze that blows cool and pure along the corridors, that is like nothing else. The company on the _Titanic_ woke up on Friday morning to begin in earnest their four days of isolated life. Our traveller, who has found out so many things about the ship, has not found out everything yet; and he continues his explorations, with the advantage, perhaps, of a special permit from the Captain or Chief Engineer to explore other quarters of the floating city besides that in which he lives. Let us, with him, try to form some general conception of the internal arrangements of the ship. The great superstructure of decks amidships which catches the eye so prominently in a picture or photograph, was but, in reality, a small part, although the most luxurious part, of the vessel. Speaking roughly, one might describe it as consisting of three decks, five hundred feet long, devoted almost exclusively to the accommodation of first-class passengers, with the exception of the officers’ quarters (situated immediately aft of the bridge on the top deck of all), and the second-class smoking-room and library, at the after end of the superstructure on the third and fourth decks. With these exceptions, in this great four-storied building were situated all the most magnificent and palatial accommodations of the ship. Immediately beneath it, amidships, in the steadiest part of the vessel where any movement would be least felt, was the first-class dining saloon, with the pantries and kitchens immediately aft of it. Two decks below it were the third-class dining saloons and kitchens; below them again, separated by a heavy steel deck, were the boiler-rooms and coal bunkers, resting on the cellular double bottom of the ship. Immediately aft of the boiler-rooms came the two engine-rooms; the forward and larger one of the two contained the reciprocating engines which drove the twin screws, and the after one the turbine engine for driving the large centre propeller.