In addition to the more common and usually planted deciduous trees and shrubs, there has been a great and very charming accession to our ornamental plantations, within the past five or six years. The searches of Dr. Hooker, Messrs. Fortune, Douglas, and the other collectors of the Royal Botanical Garden, at Kew, and of the Duke of Devonshire, have been attended with the greatest success; in addition to which, our own active intertourse with California has very materially increased the variety, which is now becoming gradually acclimatised and adopted into the gardens and pleasure-grounds in this country.

Among the,many new and beautiful plants which seem to have proved perfectly Lardy, even as far north as Albany, and perhaps further, the Forsythia viridissima, and the Weigela rosea, are among the most attractive; the former, one of our earliest and most profuse blooming spring shrubs; and the latter, covered with its roseate flowers from the middle to the last of May, partaking somewhat, (though much more beautiful,) of the character of the Fly Honeysuckle.

Among the newer Magnolias, the M. fuscata, cordate, Frazeri, longifolia, striata, and gracilis, all prove quite as hardy as the conspicua, Soulangeana, tripetala, acuminata, macrophylla, glauca, etc., all of which, say twelve or more, are quite hardy here, and should be in all collections.

To this portion of plantations, which all flower about the same time, should be added the Pawlonia imperialis; the different varieties of Hawthorn - the single white, red, and pink, [these three grafted on the same stock, have a pretty effect,] the double white, the double red, and the variegated leaf; and the Andromedas, [these are evergreens.] The English Azaleas, than which nothing can be more brilliant and gorgeous, and the newer Belgian varieties; the true Deutzia gracilis and Deutzia scabra; and the Ribes sanguinea (double), the Ribes Gordoni, and the Ribes speciosa, are all beautiful and rare. The double-flowering Sloe, the double-flowering Plum, Peach, Cherry, and Apple, and the Spircea prunifolia, are all beautiful. To these add the double pink, white and yellow Horse-Chestnut, and the dwarf Horse-Chestnut, all blooming in quick succession.

There is no end to the Spiraea family, and they abound in beauty. The many are well known. Lindleyana, Douglasii, Reevesii, and prunifolia, are among the newest.

The Chinese Wistaria, if trained to a pole eight or ten feet high, and kept well cut back for some years, will, in process of time, have all the beauty and appearance of a weeping tree, and what is even more valuable, bloom in succession all summer.

The French and African Tamarisks are pretty and hardy.

Among the variegated trees and shrubs, the variegated Sycamore, Oak, Elm, Beach, Chestnut, Maple, Horse-Chestnut, Syringa, Euonymous, Currant, and Thorn, all do well upon this place, and are striking aud interesting varieties. The variegated-leaf Dogwood is very rare and curious.

The cut-leaved family is also very carious. The pre1ttiest of these are the cut-leaf Beech, the cut-leaf Horse-Chestnut, and the cut-leaf Ash. Though the cut-leaf Linden, and cut-leaf Birch, are desirable in a collection. [The cut-leaved Birch is, to our taste, one of the most elegant trees recently introduced. - Ed].

The purple trees and shrubs are the copper and purple Beech, the purple Filbert, and the purple Berberry. A few of these intermingling with the fanciful, gay foliage of the variegated Sycamore, Syringa, Thorn, etc., have the prettiest effect, if not oven-done, or too much, or too glaringly exposed.

The weeping trees are now, generally, so well known, as hardly to require mention. The old and new Weeping Birch; the lanceolate-leaved Weeping Birch; the green and purple Weeping Beech; the old green, the yellow, and the lanceolated Weeping Ash; the Weeping Sophora; the Weeping Horse-Chestnut, Oak, Elm, Poplar, Thorn, Laburnum, Cotoneaster, Peach, Cherry (three varieties), Euonymus; besides half a dozen more of the smaller shrubs, grafted standard high, and allowed to weep down, such as the Caragana arenaria, Euonymus linifolia, Caragana frutescens, Cytisus Iessifolia, etc.

One of the most desirable and beautiful trees, at this season, is the Virgilia lutea-beautiful in its habit and foliage, and exquisite in its bloom.

The purple and oak-leaf Laburnum are worth a place in any shrubbery. The oak-leaf Hydrangea is quite hardy and desirable.

For hedging, the most beautiful are the Hemlock, the English Yew, and the Beech; the most serviceable, the Buckthorn, Washington Thorn, and Osage Orange.

Among the Elms, the Ulmus glabra pendula, the Scampston Weeping, and the Camperdown Weeping, are very remarkable.

There are a good many fine foreign Elms, not pendulous in their character, yet well worth planting. Such as the Chichester, the Cornish, the Exmouth, the Huntington, the English Cork, the Dutch Cork, the Scotch and the English Upright - a most valuable tree, from its property of retaining its foliage, green, long after the surrounding trees are stripped.

Among the rarer Maples, are the silver striped leaf; the Norway, (the finest, I think, of all Maples;) the Acer Tataricum; the English, with a very dense, round, habit of growth; and the purple Maple, with leaves of a rich dark green externally, and of a chocolate brown underneath.

Besides the Ashes above enumerated, are the Willow-leaved; the Aucuba-leaved, blotched with yellow, like the Aucuba Japonica; the Myrtle-leaved; and a new and pretty variety, originated, I believe, with Messrs. Ellwanger and Barry.

The Turkey, the Overcup Oak, and the English Royal, Lucomb, and Fulham, and our different American varieties, are, of course, all desirable, where the size of the place will admit.

I shaft end this chapter with one more tree, which to my taste is, among deciduous trees, one of the most graceful and fairy-like of all of the large collection I have here, and that is the new Weeping Larch, grafted twelve feet from the ground, and certainly most charmingly graceful in its awaying, pendulous habit, as much so as the Weeping Willow.

[At our request Mr. Sargent has very kindly sent us the above notes on deciduous trees and shrubs of comparatively recent introduction. To gentlemen who are setting about improving their grounds, or extending their plantations, and are anxiously inquiring what they should plant, this list will be of great service. We prefer the opinion of an amateur in these matters, provided he have the requisite taste and experience to base an accurate judgment upon, because professional men recognise such trifling distinctions, and are so prone, even honestly, to magnify any novelty of character, that their descriptions are seldom realized by the mass of cultivators. Two Roses, for instance, that a professional Rose-grower would pronounce as dissimilar as possible, would pass for one and the same thing with nine-tenths of the amateur cultivators. So it is in the peculiarities which characterize different species and varieties of trees and shrubs. - Ed].