The mansion, externally, is of the Doric order of Grecian architecture, with its heavy cornice and massive balustrades, its public rooms finished in the Ionic. The front hall of entrance recedes six feet within the front wall of the building, covered by a portico the width of the recess, projecting twenty-five feet, and the height of the house, with stone pillars and steps. The hall is also the height of the house. From about midway of this room, passages lead off to either extremity of the building. The rooms at the extremity of these passages terminate in octagonal projections, leaving a recess of three equal sides, into which the passages enter; piazzas the width of this recess, projecting six feet beyond, their roofs the height of the house, and resting on brick arches, cover the recesses. The northern one connects the house with the public terrace, while the southern is sashed in for a green-house. To the east of these passages, on each side of the hall, are lodging-rooms. This front is one-and-a-half stories. The west front the rooms occupy the whole height, making the house one story, except the parlor or central room, which is surmounted by an octagonal story, with a dome or spherical roof. This was designed for a billiard-room; but, before completion, a law was passed prohibiting public and private billiard-tables in the State. It was to have been approached by stairways connected with a gallery at the inner extremity of the hall, which itself forms the communication between the lodging-rooms on either side above. The use designed for the room being prohibited, these stairways were never erected, leaving in this respect a great deficiency in the house. [Illustration: MONTICELLO:--PLAN OF THE FIRST FLOOR. 1. Mr. Madison's room. 2. Abbé Correa's room. 3. Turning Buffet. 4. Niche in tea-room, intended for a statue. 5. Jefferson's chair and candle-stand. 6. Mrs. Randolph's harpsichord. 7. Globes. 8. Work-bench. 9. Couch on which Jefferson reclined while studying. 10. Jefferson's dressing-table and mirror. 11. A convenient contrivance on which to hang clothes. 12. Jefferson's chair, with a small book-case near it. 13. Great clock over the hall-door. 14. Reclining statue of Ariadne. 15. Gallery connecting the upper stories of the house. PORTRAITS. _a._ Americus Vespucius. _b._ Columbus. _c._ Locke. _d._ Bacon. _e._ Washington. _f._ Adams. _g._ Franklin. _h._ Madison. 16. Bust of Napoleon. 17. Ceracchi's Bust of Jefferson. 18. Bust of Hamilton. 19. Bust of Voltaire. 20. Bust of Turgot. 21. Bust of Alexander, Emperor of Russia.]