The Forsythia viridissima, Spirea pruni-folia flore pleno, Weigela rosea, Magnolia conspicua, with many other deciduous trees and shrubs, do infinitely better here than in England - they grow more luxuriantly and thrifty, and bloom more profusely and fine. Beautiful as the English holly is, and desirable as it may be to cultivate extensively in this, our climate is such that its cultivation can never become general. Intense cold it does not like, and a brilliant burning sun is destructive to its foliage, which nature designed for a more humid, temperate climate. In the northern provinces of China are found some beautiful hollies - Hex cornuta, microcarpa, etc. Here are plants from the same regions as the Forsythia, Weigela, etc., plants that bear as great a degree of cold, and as burning a sun in their native country, as our Middle States can give them. Why, then, should they not, like the plants I have already named, feel as much at home in this country as there. China also gives us beautiful oaks - Quercus inversa, sclerophylla, etc.; also, the beautiful Berberis Japonica, with many other charming evergreens, all of which are deserving of a trial here, as many if not all will adapt themselves to our climate.

The camellia, coming to us from more southern provinces of that empire, is not hardy. Let me, however, assure the reader it will stand many degrees more frost than many cultivators suppose. In England it is more hardy than the English laurel. I know in that country many magnificent specimens that have braved many winters - winters that have shook and injured the English laurel, and destroyed the laurustinus, yet failed to injure or destroy a branch or leaf of the camellia. They are in England perfectly hardy. Olea fragrant, Ligustrum lucidum, Euonymus Japonica, Photinia serrulata, etc., are Chinese evergreens which may be considered hardy in the latitude whence I write. Indeed, about New York many of them are nearly or quite so. Should not this make us think well of their kindred which are coming after.

Beautiful and lovely as these broad-leaved evergreens are, the conifers of these countries are more invaluable to the gardens and scenery of this, as they find themselves here perfectly at home. I said, "the size of foliage is no criterion by which to judge the degrees of heat or cold which a plant will bear," yet it is a well known fact that all or nearly all the evergreen trees of cold regions are small-leaved, and included for the most part among conifers. If cold latitudes produce broad-leaved evergreens, they are for the most part decumbent shrubs, which grew in forests under the shelter of other trees. Glancing at the opposite latitudes - the tropics - we may at first suppose the case is different, as in the hotter parts of South America, East and West Indies, the trees have broad, expansive foliage. But here it should be borne in mind that the atmosphere is extremely humid, which counteracts the effects of intense heat upon the foliage. Recent explorations in Australia tell us that the heat of that country is much greater than those I have been describing; indeed, among the hottest in the world! This intense heat is extremely arid, and must as a consequence be very trying to vegetation; but nature ever correct has given a twist to the petiole or stalk of the leaf, which makes that stand on edge, with both sides equally exposed to the air and light, and both sides of the leaf are much alike.

This is more generally true of the trees of Australia, but not of the shrubs. Now for what purpose has nature done this, if not to turn off the intense arid rays of a burning sun, which would under ordinary circumstances destroy the foliage! From this I think we may argue that small-leaved trees, such as conifers, will also stand more heat and sun than broad-leaved trees of these regions; and this class of trees we may expect more adapted to our climate, which proves to be the case.

The native evergreens of this country, as the American arbor vita?, American yew, white pine, and even the most beautiful of our evergreens the hemlock spruce, have a pale rusty brown appearance during the winter. Many will perhaps think I am not doing the hemlock justice in writing thus much; but had they seen it grouped side by side with the dark, rich, grassy green foliage of the Californian pines, such as Pinus insignis, or many of the eastern conifers, they would see more plainly the force of my remarks. It is not my wish to depreciate the beauty of this tree, if I could do so; beautiful it truly is, yet justice compels me to say, in point of coloring it must give place to the conifers of other regions. What are the causes which produce this rusty appearance I have been describing! I have no hesitation in ascribing it to the cold of winter. The Cryptomeria Japonica is a good illustration of this. Grown in the open air in this country or Britain, it assumes that disagreeable rusty appearance through winter; in a green-house it retains its green color through winter, also in some of the milder parts of Britain. I have seen plants in the open air in that country as rich a green in the month of March as they had been in the early fall previous.

This I have observed upon the same grounds, - where the plants were sheltered, they retained their green appearance; where more exposed, they became rusty. California having a mild climate, its native trees retain through winter their rich green appearance. This the conifers from the Mexican mountains also do, as well as most of the conifers and other shrubs of Europe. The Himalayan conifers retain as well through winter their beautiful green. Not so with the conifers from China; most assume in winter and early spring that disagreeable appearance I have been describing. What cultivator has not observed this with the Chinese arbor vitae (Biota orientalis)! In early spring, after passing through a severe winter, this appearance is common to it, though in the previous fall it had a beautiful green appearance. The case of the Cryptomeria has been already noticed. If, therefore,.the beautiful and graceful hardy conifers of Asia are worthy of culture, how much more so are those which retain their charming verdant color through the very depth of winter.

(To be continued).