Hampton, the seat of John Ridgley, Esq., some nine miles north of Baltimore, towards the Pennsylvania line, will strike the visitor, accustomed to the cottage ornee only, as expressing more grandeur than anything in America. The mansion, situated on a domain of five or six thousand acres, was erected soon alter the Revolution, 1783 we think, is one of those elegant and yet substantial dwellings which our fathers knew so well how to enjoy. It brings at once to the mind the " Republican Court," as Mr. Griswold calls General Washington's establishments, and one expects to see Martha Washington issue from the door in the dress of the portraits in that veritable book. The facade is one hundred and eighty feet in length, with offices attached; it is all of the best materials, and in the finest preservation. The entrance hall is of great width, and passes the visitor to the south front, where is the terraced garden. This hall is furnished as a large living-room, and is, in fact, such, with the addition of its being a noble picture gallery, where are collected some of the best specimens, including family portraits in full lengths by Stewart and the best painters of the day.

The large windows at the sides of the doors are embellished with fine colored glass in elaborate figures and pictures, and take it altogether we do not hesitate to pronounce the tout ensemble of the very finest kind; the expression involuntarily occurs - "And Grandeur, a magnificent abode".

If all this strikes you as new and beautiful and rare, the impression is soon enhanced by the kind greeting and the suavity of the lady of the mansion, who would grace a palace, or make a kingdom of a cottage; other members of a large family could be particularized, if it were our duty, or it were modest to paint portraits; and it is just here that our difficulty occurs as we attempt descriptions where the best half has to be entirely omitted. Suffice it, then, to say that at the mansion of " John Ridgley of Hampton" there is everything that the human mind need covet, and that it fully represents at this day, the scenes of what, for want of a better, we mast again call the "four-in-hand" style, here literally such, but on which it is not now our object to dwell.

Some of-the original "planting was good for that age, but our ancestors had not the same choice of trees as their descendants, and if they even knew what to plant, could procure the trees only at great cost and with difficulty. Importations were unknown, and transportation from the few commercial nurseries was attended with too great delays to expect success. Fruit-trees were almost the only things sold in those days by nurserymen. The resort then was to the trees of the vicinity, and at Hampton are specimens of cedar hedges of much age that most emphatically exhibit their want of adaptability for that purpose as a permanent ornament. They have had a period of beauty, have lost their lower branches, have been cut by the frost and the winds, and are to be replaced with hemlock and arbor-vitae, etc. The old cedars dispersed about the terraces, and which must have had a good effect when in their perfection, are now much injured, but still stately, and telling of the days of their elegance when a former generation inhabited the mansion.

With this exception, the terraced garden and the flower garden are entirely complete. Grass is employed for its broader walks to prevent washing, and it is kept short and in the finest condition; the whole air is that of neatness, and presents a scene entirely in accord with the dwelling. We could not but remember the terraces at Versailles as we stooped in the shadow of long rows of full-grown lemon, orange, and shaddock trees, covered with enormous fruit, blossoms, and leaves, giving an expression which nothing ever will give that is not foreign to the climate. The lemons on these trees are of extraordinary size; this family of exotics has a large house for its especial winter quarters.

A beautiful Swiss cottage in fine taste greets the weary at one end of the garden, and behind it are the extensive hothouses, graperies, and orchard-houses, from which the best evidences of the success of the gardener, Peter Reed, were found on the dinner-table. Mr. R. should remember, and he probably does, that the Americans say Prince Albert has got "a good situation, and if a gardener can congratulate himself on having one also, it should be Mr. Reed. He is surrounded as few can hope to be.

We could take our readers to the fine stables, and record their costly contents, describe works of art, and the glowing ruddy grandchildren who embellish everything, but we refrain. Hampton has rarely appeared in print, and one scarcely knows where to lay down the pen when such fascinations are met with in such profusion.

The owners are fully impressed with the beauty of trees; some very fine specimens are around the mansion, and progress is marked by the conversation in which the relative success of importing from France or England is knowingly discussed.

The neighborhood of Baltimore will afford us occasion for one or two more sketches.