The rooms on the second story are intended for the most part as exhibition halls for the display of works of art which have come into the possession of the Library through the operation of the copyright law, or of books and manuscripts of special interest on account of their rarity and curiosity. One room, for example, is intended to contain a collection of early printed books and, in general, such volumes as best illustrate the history of printing; another room is for books relating to the early history of America. The North Gallery is the Map Room; the South Gallery is the Print Room, for engravings, lithographs, etchings, photographs, etc., illustrating the progress and development of the reproductive arts. [Illustration: SOUTHWEST GALLERY.--THE SCIENCES.--BY KENYON COX.] There is space here to speak only of the more richly decorated of these rooms--the corner pavilions and the two galleries on the west side. The others, as the visitor will see in walking through them, require no special description. The walls are decorated in broad masses of plain color, with deep friezes of simple but interesting patterns. The decoration varies from room to room, but all are united in a single intelligent harmony of color. Each contains a long skylight surrounded by a stucco border left plain in most of the galleries, but in the Print Room enriched by coffering decorated with gilt “cherubs’ wings.” The skylights are ornamented with a simple design of stained glass. The chief colors employed are purple and pale green and yellow, and the design includes the names of men distinguished in American history and in art, letters, and science.[11] SOUTHWEST GALLERY. The chief decorations of the gallery into which one goes from the South Corridor of the Entrance Hall are two large tympanums by Mr. Kenyon Cox, one at each end of the room over the triple doors by which one enters or leaves. For the rest, the room is lighted, like the other galleries, on both sides, so that one may look out toward the Capitol, or, on the east, into one of the interior courts. The ceiling is an elliptical barrel vault, rising to a height of twenty-nine feet. It is set with square coffers in blue and gold, and divided by double ribs which spring from the paired pilasters. Between the pilasters a bright-colored arabesque is introduced, in which blue is the prevailing color. It is continued in the ceiling by an arabesque in relief, the most conspicuous features of which are seated cherubs, and medallions with the letters “C. L.”--standing for “Congressional Library.” The floor is Vermont, Italian, and Georgia marble, laid in square panels, so as to reflect, in a way, the pattern of the coffers in the ceiling above.