Every observer has noticed the difference between the starting of vegetation in spring in different localities, and those often but a few feet separated. In the mountain glen, shut out from cold winds, and almost from sunshine, there is usually a difference of some days in the starting of the leaf and opening of the blossom compared with the occurrence of the same event on the hill top near by, where rude winds sweep unresisted. On the south and east sides of the grove the same effect is always visible; verdure and freshness are seen there, when in the open field nothing greets the eye but the desolation that winter has wrought. Even the few trees that are sometimes planted around dwellings are found to modify the climate - softening the asperities of winter, and yielding cool and healthful breezes in summer.

These facts, so common and so strongly marked, must have been noticed by every one, and yet how few of the many who deplore the severity of climate - lamenting the ravages of frost both in late spring and early autumn - have ever taken the hint from Nature to protect fields and gardens by belts of trees, not only from these frosts, but the cold breezes of winter and the rough winds of early spring ? We prophecy a reform in this matter - not immediate and universal, to be sure, for such an event, even in these days of rapid progress, would be miraculous. But the thing is beginning to be done. Its benefits are seen and appreciated, and, if we mistake not, before the commencement of the next century such protections will be as common as gardens, if not as numerous as cultivated fields.

The objections which will be brought against this improvement are easily anticipated. First, the everlasting objection to setting out trees of all kinds, that "it will take the belt so long to grow large enough to be beneficial" comes up. The world has always been full of such prudent calculation in all rural matters. They have been, and are now, an overwhelming majority, but a majority that can not rule; and while they have, with the thing and its utility before them, been resting quietly in such a supposition, the humble minority have been engaged in the work, and are now enjoying the benefit of their labors. Another objection we have heard stated was, that "these belts will occupy too much land." They will take land, to be sure; and we mistake very much if they do not make land, too, by increasing the fertility of what remains by ameliorating the temperature, so that it actually produces much more in actual value than the whole did under the unprotected dispensation. New powers of fertility will be given to the soil, and new products will be introduced with greater prospect of success, and twenty articles of comfort and luxury which, if grown at all, were of indifferent quality, will be raised in perfection.

But the land occupied by the belt is not lost. In all the older sections of our country, and on the prairies, every tree that grows in the field or forest, no matter where, adds to the value of the estate. It is so now. It will be more strongly felt in the future, unless some new project shall be introduced to cut off the necessity of fuel and timber; an event not likely to take place. So these belts, if they become too unwieldly in size, or if through the amelioration of climate from natural causes (which we can not expect) so that they are cumbersome or useless, will pay a good per cent. on the value of land when taken off. They need not, under any circumstances, demand a width of more than ten or twelve feet; all beyond this may be appropriated to ordinary purposes of cultivation. We give this as the extreme quantity - all they will require when fully grown, so as to soften the atmosphere for many rods. In the early stages of growth - say for the first ten years - they will require no more ground than a heavy wall, and less than a Virginia rail fence.

Belts of deciduous trees would be highly effective, but evergreens are best adapted to the purpose, from the compactness of their branches and leaves, which, when trained by shortening-in the branches, will render them almost impervious to winds. The Pine and the Hemlock are probably best adapted to the purpose from their extreme hardiness and compactness of form. The Cedar and Fir, in proper localities, will probably prove equally beneficial for the object.

The imaginary difficulty of successfully transplanting evergreens will doubtless be an obstacle in the minds of many to their adoption for this purpose. But it need not be. They may be as safely transplanted as the Poplar or Willow, if proper care is used in the operation. The ground where they are to be set should be prepared previous to their being taken up, as this will shorten the time of the roots being out of the earth and exposed to the atmosphere, which, without proper precaution, is injurious to any tree. The ground should be prepared by opening a trench amply wide enough to receive all the roots that can be obtained, and allow them to lie extended in their natural position, and so deep that the mellow earth may be thrown back for them to rest upon. They may then be set by a line and loose earth thrown in until the roots are so far covered as to allow ample space for the first year's growth; after which the sod, if it was sod land, may be thrown in, grass down, and be useful in keeping them in their places, and by decay furnishing food for future growth.

In taking up the plants more than ordinary care is necessary, as they are more sensitive of wounds and bruses than most deciduous trees. It is often the case that they may be found in low, swampy lands, growing over old moss-covered logs, when the roots must necessarily lie near the surface, until they extend to the soil beneath. Such plants, with nearly all their rootlets and the soil connected with them, can easily be obtained, and a failure in them is wholly unnecessary. They would soon dwarf and die if allowed to remain on their log home, but transplanted they become vigors ous, thrifty trees. Next to this they can best be obtained from old fields on the margin of swamps, where the soil is often thin from repeated washings, and the subsoil too stiff to allow the roots to penetrate it. In a wet time, like spring or autumn, they can be easily taken out with all, or nearly all, the soil adhering, and in a situation to have it removed with these to their new locality. Such trees are usually best for screens; for, from being continually exposed to the atmosphere, they have acquired a hardiness beyond that attained by sheltered ones.

Their branches are firmer and thicker set, which renders them better adapted to the object If the branches are inclined to grow long and occupy too much land, they may be shortened-in and trained in a conical form, when they will present a beautiful wall of verdure at all seasons, so forming an ornament to the grounds, as well as a protection from winds and the fierce driving storms.