THERE are many beautiful and valuable trees that have not found their way generally into cultivation; we can count but one specimen of Cedar of Lebanon of commanding size in the United States, probably from the circumstance that the seeds rarely, if ever, vegetate when imported. Our ancestors were not much in the habit of importing trees, and we now lament the deficiency of the variety that so much delights the traveller abroad. That single specimen is in Westchester County, New York, and is a noble and expressive, as well as historical tree. This cedar should not be neglected by planters; its growth is thought to be slow, and too few of us are willing to purchase what will not attain some stateliness in the lifetime of an individual. But it is usually starved and stunted in a pot before it is planted out; then most generally treated to a poor sandy, dry soil. In a good, firm, loamy soil, at least in this country, it will neatly rival the Deodar in rapidity of growth; in a rich soil, rather moist, this beautiful tree is a fast grower, though this is contrary to the received opinion.

The most beautiful trees are frequently the most rare among us; even some which are native continue extremely scarce. As an instance, the Magnolia macrophylla, a native of Florida and perfectly hardy here, is too seldom met with in perfection, and is scarce in most nurseries, though a demand is producing its sure result, a supply. The long leaves, peculiar growth, and superb flower, all point it out as one of the most desirable and ornamental.

The Gordonia pubescens, and the lasianthos are rarely seen; we have a specimen of the first forty feet in height, which annually sheds in September its thousands of single camelia-like flowers, that fairly perfume the air. It is hardy in this latitude on high ground, and after it is once established is never injured by cold.

The Magnolia grandiflora, that most superb of evergreens, is hardy in some situations near Philadelphia. Two large specimens are growing on the farm of Owen Sheridan, Esq., at Chestnut-Hill, and have never been protected within the memory of man. Annually it gives forth its superb blossoms, which are sent round the neighborhood in profusion. Other specimens exist and flourish here; but in lati. tudes a very little south of this city they have nothing to contend against. At Nor. folk and Richmond they attain great size, and fairly sparkle in the sun, yielding a second bloom in August. Plant it, all who can obtain it, if only a single tree.

The Holly is a sadly neglected tree, but from the recent notices of it may become ere long a favorite native. While we are courting the growth of half hardy foreigners, let us not omit the planting of one of the best of our own.

The Virgilia lutea, or Yellow-wood, is extremely rare and scarce in the nurseries. A native of Tennessee, and indigenous to but a small district, the seeds have been difficult to procure, and here it rarely perfects them. Its fine racemes of flowers beautiful leaf, peculiar stem, and the superb autumn yellow of its foliage, make it a favorite wherever known. Efforts have been made to procure the seeds, and it may become, ere long, more common. It should never be omitted where variety is consulted.

The Celtis crassifolia is in the same list of the rare and beautiful, and for the Southern States the Styrax grandifolium* and laevigatum, the Andromeda mariana, the Myrica cerifera, Hopea tinctoria, Ostrya Virginica, the June berry, the Itea Virginica, the Cyrilla racemiflora of Virginia, the Viburnum prunifolium, and a vast many which should long since have obtained a footing among us, are yet known to few. An enumeration such as we have briefly attempted may serve to call attention to a list which could be greatly extended. Merely naming them here will probably call out from some of our correspondents facts, and opinions, and experiences, which will be valuable.

Of native fruits we have neglected to prove the value of the wild Virginia plum, which the Abbe Correa said, if cultivated, would equal that unknown article " the nectar of the gods." The Custard Apple, Anona triloba, is rarely included in any list for public or private cultivation, and yet it is one of the most remarkable of our fruits - the only tropical looking tree product that we have ; highly ornamental and every way worthy of attention and care.

The Persimmon, Diaspyros Virginiana, too, is a beautiful tree, and the fruit eaten at the happy moment is worthy more attention than it has yet received. The fruit of the Persimmon varies much even in the wild state. Some are so exceedingly astringent that it takes a very severe frost to render them palatable even to an opossum ; others are so accommodating as to afford a glout morceau long before winter pears are ripe.

The Persimmon has a fine green foliage, extremely grateful to the eye, and it should be employed occasionally in ornamental planting.

The Buffalo Berry, Shepherdia argentea, among the smaller trees, may also be mentioned as one of our too long-lost natives. No plant with which we are acquainted has berries which so universally please, - rich in their deep scarlet color, - and almost transparent in their pure waxy hue, - the most unsusceptible to the pleasures of an arboriculturist, could not pass it without loitering to admire. Its scarcity is perhaps as much owing to the difficulty of obtaining good seeds as from any other cause.

Bearing seperate sexual organs in different plants, the berries are worthless unless grown in the vicinity of a male tree. It may, however, be readily increased from layers.

There are few small trees prettier than our Copal Sumac, Rhus copallina, with its peculiar winged leaves ; but though easily to be obtained in almost every state, it is quite unknown in cultivation. Fortunately a foreign nurseryman, in his catalogue got up for Americans, advertises it amongst his "Plantes Nouvelles" at "only" .75; so having got a foreign reputation, we shall soon find our dollars flying in its direction as a " new" introduction, and perhaps some society awarding a gold medal for its exhibition for the first time!

We might proceed with a list of many other neglected trees, and hereafter we may do so. A study of the peculiarities and forms of trees in both their summer and winter aspects, is one of the most agreeable, instructive and pleasing occupations ; it gives pleasure wherever we are. In travelling, when time is not allowed to dip into geological or botanical research, every tree you pass and can name, is recognized as an old friend.

• Styrax grandifolium is porfecrly hardy here, and most probably would bo in any part of the States.

A beautiful tree, considered in point of form only, must have a certain correspondence of parts, and a comparative regularity and proportion, while inequality and irregularity alone will give a tree a picturesque appearance, more especially if the effects of age and decay, as well as of accident are conspicuous : when, for instance, some of the limbs are shattered, and the broken stump remains in the void space; when others, half twisted round by the winds, hang downwards; when others again shoot in an opposite direction, and perhaps some large bough projects sideways from below the stag-headed top, and then as suddenly turns upwards, and rises above it. The general proportion of such trees, whether tall or short, thick or slender, is not material to their character as picturesque objects ; but where beauty, elegance, and gracefulness are concerned, a short thick proportion will not give an idea of those qualities. There are certainly a great variety of pleasing forms and proportions in trees, and different men have different predilections, just as they have with respect to their own species ; but no person is to be found, who, if he observed at all, was not struck with the gracefulness and elegance of a tree, whose proportion was rather tall, whose stem had an easy sweep, but which returned again in such a manner that the whole appeared completely poised and balanced, and whose boughs were in some degree pendent, but towards their extremities made a gentle curve upwards, as in many specimens of the Norway fir: if to such a form you add fresh and tender foliage and bark, you have every quality assigned to beauty.