XXXVI. _First Græco-Roman Room._—The Etruscan monuments are succeeded chronologically by the Græco-Roman, here placed so as to adjoin the galleries both of Greek and of Roman art. In accordance with the character of Græco-Roman sculpture, the apartments containing it should be somewhat ornamentally constructed and arranged, as in the great continental museums, where works of this class form the staple of the collections. The position of the principal objects in all this series of rooms is marked in the plan, without distinguishing them individually, as none are of such a character as to require any special architectural provision. The first room is one hundred and six feet by twenty-six, exclusive of the alcoves. Its height need not, for the display of statuary, exceed twenty feet; but if, for architectural effect, a vaulted ceiling is preferred, the height must be increased. In the Braccio Nuovo, in the Vatican Museum, which is probably the finest gallery of this kind in Europe, and has a cylindrical vault, with a central skylight, the proportion of height to breadth is about thirty-seven feet to twenty-seven; but in the darker climate of London the height should not, if possible, exceed the breadth. [Sidenote: SECOND GRÆCO-ROMAN ROOM.] XXXVII. _Second Græco-Roman Room, or Rotunda_, sixty feet in diameter, and about sixty feet high in the centre, being surmounted by a hemispherical dome.—This room is, with slight variations, and on a somewhat smaller scale, a copy of the Rotunda in the Museum of Berlin, an apartment universally admired for its architectural beauty, and only defective as a hall for sculpture from the unnecessary smallness of the central skylight. The entablature over the columns would support a gallery, opening into the first floor of the western buildings. [Sidenote: THIRD GRÆCO-ROMAN ROOM.] XXXVIII. _Third Græco-Roman Room_, similar to the first, but only one hundred and one feet long, exclusive of the northern alcove. The spaces between the lateral alcoves on the east side of the First and Third Græco-Roman Rooms might either be covered with glass, or left open for ventilation, though the second arrangement would involve a provision for the drainage below. [Sidenote: SUMMARY OF ACCOMMODATION FOR GRÆCO-ROMAN SCULPTURES.] The amount of accommodation for Græco-Roman sculptures cannot, from the form of the rooms, be stated with the same exactness as that for the Greek. Exclusive of the alcoves, there would be in the—