Before leaving the Rotunda it should be added that it is possible to ascend into the Lantern by taking either of the winding iron staircases in the piers on the left and right of the west gallery. The staircases in all the piers carry one up into the space between the two shells of the dome, where it will be necessary from time to time for workmen to go in order to paint the iron framing and thus preserve it from rust and decay, but only these two are open to the public. On the way up one has a chance to observe the interesting construction of the dome; and in the Lantern, which is left unfinished except in the portions seen from below, one may look over the parapet and down into the Rotunda. By taking the staircase to the right, moreover--to the right as one originally enters the gallery from the Entrance Hall, that is--one reaches a door through which one may pass out to a little gallery encircling the Rotunda in the open air and affording a beautiful view of Washington and the surrounding country. Or, if one chooses to defer this little expedition, it is possible to make the trip without retracing one’s steps by taking the elevator on the first story of the Entrance Hall and getting out on the attic floor, from which one may enter either of the two stairways just described. THE RECTANGLE. In going through the various galleries and pavilions of the Rectangle it is perhaps more logical to begin on the library floor, but supposing the visitor to be about to leave the Rotunda by the way in which he has come, it will save a little time to take the second story first. Both are alike, so far as the arrangement of rooms is concerned, except that on the first story one leaves the Entrance Hall by a narrow corridor, while above one enters the galleries directly. The arrangement is very simple, as will be seen by looking at the plan of the building. The pavilions are connected by long galleries, two on the west and east sides, where the Rectangle is interrupted by the centre pavilions, and one each on the north and south sides. The corner pavilions of both floors contain octagonal-shaped rooms, which, in the second story, have domed ceilings and mosaic floors, and are richly embellished with paintings and sculpture and relief decoration in stucco. The East Pavilion contains a small staircase and a good sized but plainly finished room on both stories.