There is no other class of arborescent vegetation that is so well marked in character, and consequently so well calculated to produce beautiful effects in the landscape art, than that which embraces the trees with drooping branches. The greater portion of them must be grouped under the general title of the beautiful rather than the picturesque, and yet, strange to say, horticulturists, in the majority of instances, have to be educated up to a certain point before they can fully appreciate the real value of these graceful specimens. Nurserymen more than any others are aware of this fact, on account of the frequent inquiry, "For what use are those curious trees intended; and why do they grow upside down?" But although odd, and to a certain extent uncouth in appearance in their younger years, weeping trees are the very opposite at maturity, and especially when their graceful 'drooping branches are in contrast with the round-headed or spiral-pointed classes. On the outer edge of a group composed of the above, the former shows to great advantage, and at once relieves all idea of stiffness that might otherwise appear.

If we were asked the question, what one species or variety is the best, taking everything into consideration, we should unhesitatingly answer, the Weeping Beech among deciduous trees, and the Hemlock Spruce among evergreens. This will doubtless run counter to the preferences of many of our readers, but the two above named are at least unexceptionable, and what more can we ask?

Commencing with the deciduous weepers, and with our favorite, the Weeping Beech, an extended eulogy seems unnecessary, as it is well-known to be hardy, of free growth, healthy, beautiful, and adapts itself to most situations. The plan adopted of latter years for propagating this tree, is to graft in the collar close to the surface of the ground; this of course makes a finer specimen than when worked several feet high on a naked stem. In the former the drooping twigs and branches commence low down, and produce an effect at once, whilst in the case of the latter, one has frequently to wait several years before the tree becomes attractive. Divested of foliage, the Weeping Beech presents a twisted, unnatural appearance, but when clothed with its large deep green, glossy foliage, the reverse is the case - the whole head as it were droops, and the outline is full of diversified undulations, so suggestive of natural effects in planting.

Among drooping trees the common White Birch holds no mean position - we allude to the European species, Betula alba. We admire it not alone for its slendor, graceful branches, nor yet for its neat foliage, but for its pleasing white bark that pervades every portion of the tree as well. It is so entirely hardy, and shows so conspicuously among the darker verdure of other species, that it is a subject of wonder why it is not more frequently employed. A well marked form of this, now becoming quite popular, is the cut-leaved Weeping Birch, a tree that is unexceptionable where the soil and climate are adapted to its growth.

In some portions of the Middle and possibly the Southern States, this usually handsome tree does not prove satisfactory, as the lower limbs have an unfortunate habit of dying out and leaving a long naked stem; indeed the head is never so dense, nor the growth so vigorous, as when growing in Western New York, where it forms a thick mass of verdure from the ground to the summit. We presume it to be a Northern tree in its preferences. A new candidate for arboricultural honors has of late been inviting our attention under the name of Young's Weeping Birch. It is described as being very desirable, with remarkably long, slender shoots, and decidedly pendulous in character. It is about being tested with us, and promises to be an acquisition.

Among the Ashes (Fraxinus), we find several curious sports, but owing to the depredations of a persevering species of "borer" (here our entomological knowledge is at fault), the various varieties do not give satisfaction excepting in certain localities.

We have the ordinary common Weeping Ash, as well as a form with yellow bark, both varieties of the F. excelsa: then there is a variety of the F. lentiscifolia with slender branches and smaller leaves, which to our taste is the finest of all. Other kinds are in cultivation, but they are of less importance.

Among Willows, the old Babylonian species must be considered the type of this class; and for certain situations, and for producing marked effects in landscape art, it has probably no superior. On the margin of a body of water it seems peculiarly appropriate, and succeeds admirably as well, being a location too wet for many genera of trees. A new form has been introduced into our collections from France, called Solamon's Willow, which is not so drooping in character. The Kilmarnock Willow is now so well-known, that a description is unnecessary in this place, but it still increases in popularity as its merits become better known. Upon a nicely shaven lawn, a specimen of this tree standing alone, produces a fine effect.

We wish we could see as much beauty in the so-called American or Fountain Willow, but the truth is, we do not admire it, and we never did. With all our care in training, in a few years it becomes unsightly, and is at best a poor "Weeper."

The Poplars are receiving attention of latter years, and already our list of weeping varieties number four or five distinct kinds. According to our idea of beauty, however, there is but one really first class tree, and that one is among the finest of all the drooping plants; we allude to the P. grandiden-tata pendula. For a small sized specimen, it forms a strong rival to the Kilmarnock Willow, and will, we believe, in time supersede it. There is an objection, however, to its culture, which we must mention: all the Poplar family will sucker more or less, consequently this trouble will stand in the way of its advancement. Budded upon the Lombardy

Poplar, a species that is not very objectionable, the long, slender branches, reminding one of whip - cords, are full of grace and beauty; and even when worked seven or eight feet high, the branches will extend frequently to the ground in a single season. The other "sports" are inferior to the above, and in fact we do not believe they will ever become popular: among them we might enumerate the Parasol de St. Julian, Tremula pendula, Graca pendula, etc., etc.

The Weeping Mountain Ash is indeed an ornamental tree of the highest merit, but unfortunately another species of the dreaded "borer" soon eats it off close to the ground, and so voracious is this insect, that all our watchfulness is not sufficient to prevent the mischief.

In some districts, however, it succeeds satisfactorily, and there it deserves universal notice. When loaded with its crop of mature fruit, it is difficult to conceive of anything more charming.

The Weeping Deciduous Cypress is not strictly a member of this class of trees, as the branches proper are not pendant, but merely the small branchlets. It is, however, one of the finest ornamental trees with which we are acquainted. The foliage is small and very handsome, the tree is hardy and grows rapidly, and we know of no disease or injurious insects that trouble it in any way. It forms a superb avenue, and appears to great advantage in a group of Conifers, to which natural order it belongs.

The Weeping Larch is not beautiful, and yet it is decidedly picturesque, but almost any of the Larches may be changed into drooping trees with rounded heads by simply cutting off the leading shoot. On the outer edge of a group this tree certainly adds to the interest of the mass of verdure.

Reid's Weeping Peach is decidedly pretty and attractive, for in addition to its graceful drooping branches, the bloom adds another interesting feature to the tree. It was a chance seedling that originated in the grounds of the late William Reid, of Elizabethtown, N. J., and in its natural state was a sprawling shrub. Worked standard high, however, it becomes very graceful without artificial training.

The Dwarf Weeping Cherry is also exceedingly pretty, but difficult to graft or bud, hence it will never be very plenty. The branches are very slender, and the foliage quite small, which adds an additional charm to its pendulous character. For a center piece in a bed of shrubs, or even when standing singly on the lawn, it must invariably attract attention.

We doubt whether there are any fine specimens of the Weeping Oaks in America, although abroad there are a large number, and not confined to one species either, as the books enumerate several distinct kinds. The difficulty attending the importation of these specimens has been certainly a great drawback to their dissemination with us, but we suppose their propagation will be taken in hand on this side of the water at an early day.

The Weeping Sophora will succeed as far north as New York and Philadelphia, but as it does not appear ornamental for some years after removal, and never, in fact, unless trained and properly pruned, we doubt whether it will prove very popular. Still we know of several very fine specimens.

Among the finest of all large sized weeping trees, commend us to the Weeping Silver-leaved Linden. When young, it does not show to advantage, but as the tree increases with age, the limbs assume more of the drooping tendency, and the numerous small twigs, all pendant, impart a rare beauty to the symmetrical head. The foliage is likewise exceedingly attractive, and is never injured, so far as we are able to ascertain, by either insects or disease. It may be going a little too far to state, that it is unexceptionable, but if it has a fault, we are not aware of it.

The Elms furnish quite a list of drooping trees to select from, but perhaps our own native American Elm cannot be excelled. It is grace and utility combined, and if the insects would only oblige us by not molesting the leaves, we could recommend it without reserve: unfortunately, however, the whole family are troubled in this way. Our Slippery Elm (Ulmus fulua) is likewise a graceful little tree, and the various European varieties, among which we might mention the Camper-down Weeping, Rough-leaved Weeping, English Weeping, etc., are all beautiful specimens when they succeed in retaining their foliage.

There are a number of so-called drooping trees which are merely the result of some straggling sport worked on a straight body, but which have little claim for beauty - but are merely curious at best. Such for instance as the Weeping Horse Chestnut, Weeping Almond, Weeping Thorn (pretty, but only succeeds in a few favored locations), Weeping Laburnum, Weeping Honey Locust, Weeping Walnut, Weeping Heart, and Morello Cherries.

Our space is filled, and we have no room for a discussion of the merits of Weeping Evergreens. This we shall have to refer to another time.