From the engine-room the professor led the way up the spiral staircase for a considerable distance, passing landings here and there, with doors in the bulkheads, giving access, as von Schalckenberg explained, to the several decks of the vessel. Arrived at length at the top of the spiral staircase, the party found themselves in a spacious vestibule extending the whole width of the ship, and lighted on each side by a large, circular port. The vestibule floor was covered--with the exception of a margin about three feet wide all round--with a magnificent carpet, the margin of floor beyond the edge of the carpet being occupied by a number of beautiful flowering plants and shrubs in spacious and ornamental pots and boxes. From the centre of the vestibule floor sprang the grand staircase--a magnificent example of sculptured aethereum--leading to the pilot-house and promenade deck above; and immediately opposite the foot of the staircase, forming, in fact, one side of the vestibule, was a bulkhead of aethereum decorated with a series of Corinthian pilasters surmounted by a noble cornice, from which sprang the coved ceiling of the apartment. The panels formed by the pilaster were enriched with elegant mouldings of scroll-work and painted in creamy white picked out with gold. Two of the panels were occupied by massive, handsomely mounted doors of frosted aethereum, the panels of which were decorated with fanciful scroll-work of the polished metal, imparting a very rich and handsome effect. These doors, the professor reminded Lady Olivia, gave admission to the dining and drawing-rooms. Behind the grand staircase was another bulkhead, similar to the one already described, but having one door only--and that in its centre-- instead of two, as in the case of the other bulkhead. This single door gave access to a long corridor, on either side of which were to be found the staterooms, or sleeping apartments, the bathrooms, and the domestic offices generally of the ship. Lady Elphinstone was tolerably familiar with this part of the ship already; and as she wished to peep into the room which she and her husband were to occupy, she now took the lead and, opening the door leading into the corridor, passed through it, while the men turned in the other direction and entered the dining-room.