This room is 30 by 50 feet. Its floor is covered by a huge Oriental (Ispahan) rug which measures 20 by 40 feet and is more than 300 years old. Furniture is a reproduction of Louis XIV period. The large dining table could be extended to seat 30 people. A smaller table at the east end of the room was used by the Vanderbilts when dining alone or with a few intimate friends. At such meals, Frederick Vanderbilt always sat on the south side of the table with Mrs. Vanderbilt opposite him on the north side. Across the room from the doorway are two 18th-century planetaria, made in London—instruments used for the study of the sun and planets. On the walls on either side of the door are a pair of French 17th-century tapestries, believed to be of Beauvais manufacture. Florentine chairs around the walls and two carved Renaissance mantels all emphasize the spaciousness of the room. Hand-painted and gilt panels decorate the ceiling. Two marble columns of the Ionic order flank the doorway, matching those in the drawing room. All original marble work in the mansion was done by Robert C. Fisher and Company, of New York City, then one of the largest importers of marble in the world. [Illustration: _Grand stairway._ Courtesy The New York Times Studio.] The hostess made it a point to blend the color of the flowers, the cloth, and the china. If yellow flowers were being used, the lace cloth would have a yellow undercover, the service would be gold-plated, and the china would be white with a gold stripe. GRAND STAIRWAY On the wall opposite the foot of the stairway is an 18th-century Flemish tapestry. The floor in the lower-stair hall is old Italian marble. A chair and marble fernery are Italian, and a large Chinese bowl of the Ming Dynasty is about 500 years old. Italian busts and statues occupy niches along the way. At one of the landings is a painting by the French artist, Adrien Moreau. An early 18th-century Beauvais tapestry hangs on the second-floor wall. SECOND FLOOR _North Foyer._ On a Louis XVI table stands an incense burner fashioned of marble and cloisonne. Overhead is a chandelier of beaded crystal; one of similar design is in the south foyer. Hanging here are original paintings by the 19th-century artists, Schreyer, Bougereau, and Villegas. Frederick Vanderbilt was more noted for the fine tapestries he collected than for outstanding paintings. _Blue Room._ This is the largest of the guest rooms. Mrs. James Van Alen, the niece of Mrs. Vanderbilt who donated the mansion to the Federal Government, used this room during her visits to the Vanderbilts. The windows of this room command a splendid view of the Hudson and the mountains beyond. A white onyx French clock and companion pieces adorn the mantel, and a rare old (Ghiordes) prayer rug is spread before the fireplace.