Besides what may be strictly considered models, there were in the rooms some objects more suited to an ordinary museum. Such were various autographs, and many relics of Washington; and a case containing locks of the hair of all the presidents, from the time of Washington downwards. When mentioning our visit to General Cass, I omitted to state the magnificence of the Treasury, which adjoins his official residence; an enormous structure, also of white marble. We counted thirty pillars in front, of the Ionic order, besides three more recently added on a wing, these three pillars of great height being cut out of single blocks of marble. We passed this building again in going from the Patent-Office to Lord Napier's, where we had an appointment with Mr. Erskine. The noble mansion of England's representative is a cube of brick-work painted dark-brown, equal in size, and very much resembling in appearance, our own D. P. H.; but standing in a melancholy street, without the appendages of green-house, conservatory, and gate, as in that choice London mansion. The Honourable Secretary's apartment was downstairs in the area, and the convenience of its proximity to the kitchen, with the thermometer at 85 deg. in the shade, as it was to-day, was doubtless duly appreciated by him, he having just arrived from Turin. We found him waiting for us, and he accompanied us to the President's residence, called the White House. It is a handsome but unpretending building, not like its neighbours, of marble, but painted to look like stone; the public reception-rooms are alone shown, but a good-natured servant let us see the private rooms, and took us out on a sort of terrace behind, where we had a lovely view of the Potomac. The house is situated in a large garden, opposite to which, on the other side of the road, is a handsome, and well-kept square. The house has no pretensions about it, but would be considered a handsome country house in England; and the inside is quite in keeping, and well furnished. The furniture is always renewed when a new President takes possession; and as this is the case every four years, it cannot well become shabby.