THE American public is greatly indebted to Henry Winthrop Sargent, Esq., for this new (the sixth) edition of the •'Theory and Practice of Landscape Gardening:" it could not have! been committed to abler hands. The additions consist of a supplement by Mr. Sargent, bringing the work up to the day,; both on the best methods of making a country place, and an excellent account of the newer deciduous and evergreen plants lately introduced, both hardy and half-hardy.

This is done with a perfect understanding of the whole matter, and with an earnestness of purpose that will give universal satisfaction. Two styles of country places, he says, are attempted in this country: viz., a place without any trees, ox a dense wood; in the first, the effects are to be produced by planting; in the second, mostly by the axe. Taking the two places he is best acquainted with, - Mr. H. H. Hunnewell's, near Boston, and his own on the North River, - as examples of the two modes, he illustrates the results, giving a decided preference to the first. He introduces us by superb steel engravings, to Mr. Hunnewcll's beautiful mansion and grounds;

Soampston Weeping Elm, at Wodenethe Age, 6 yrs. Height, 7 ft. Circum.,86ft.

Fig.92. - SOAMPSTON Weeping Elm, at Wodenethe Age, 6 yrs. Height, 7 ft. Circum.,86ft.

The Soiled Juniper. at Woodlawn, Residence of R S. Field, Esq.

Fig. 94 - The Soiled Juniper. at Woodlawn, Residence of R S. Field, Esq., near Princeton, N. J.

Height, 4 1/2 feet Circumference, 29 feet. in his own case to a fine picture of his own dwelling, and wood cuts of the grounds; we should have been glad to see the steel employed here also, but as the publisher has put little or no advance on the price of the volume, such a course would have been an unwarrantable expense. These steel plates are most admirably executed from ambrotypes, they are as admirable as the places themselves are each beautiful. Other illustrations of new ornamental trees are given; as a specimen we insert the foregoing.

These must be acknowledged to be surpassingly beautiful; and there are others of equal merit, drawn by the publisher himself, who holds a pencil rarely excelled in its ability to give the character of foliage.

At the risk of trespassing, we are anxious to present the two plates, figs. 35 and 36, exhibiting two lovely specimens in which we take especial interest.

Mr. Sargent's judicious method of planting, is to employ a quantity of stakes or poles, ten or twelve feet high, and by placing first a stake where he thinks a tree should be planted, and then several smaller stakes at such a distance around it as the proposed tree will extend to when fully grown. By carefully observing this collection of stakes from his point of view, which as a general rule should be the principal room of the house, the •planter will at once see whether it is in the right place, whether it is too near the road or walk, or will injure a view. When satisfied by many observations - and it will be well if made from many points of view, all, however, subservient to the principal point - that the centre stake is correctly placed, let him substitute for it a small stake eight or ten inches high, with the name of the tree to be planted there legibly written upon it. In the autumn or spring, let the hole be dug at leisure, properly and care-fully prepared, and let a tree be selected from the border nursery (previously stocked for the purpose, on a damp or rainy day, and as properly and carefully planted.

Pursue this course with all the single trees, groups and masses, and if judiciously done the most complete satisfaction will be the result; because one may not only make up his own mind by studying these groups of poles, for weeks or months, even, but he can also have the advantage of criticisms from intelligent visitors; and if the poles are wrong it is much easier to remove them than the trees.

Weeping Large, at Wodenethe. Age, 8 yrs.

Fig. 85. Weeping Large, at Wodenethe. Age, 8 yrs. Height, 12 ft Cir., 25 ft.

Large leaved Magnolia, at Laurel Hill Cemetery.

Fig. 96. Large-leaved Magnolia, at Laurel Hill Cemetery. Age, 10 yrs Ht, 89 ft.

View of Water Terrace in Central Park.

Fig. 103. View of Water Terrace in Central Park.

The original condition of the ground.

Fig. 104. The original condition of the ground.

This is practical advice, but it is accompanied by the remark that it would be no more fair for a person new to planting, to be expected to make a fine picture in this way, than it would for a farmer to go to town and make a lawyer, a doctor or a merchant of himself, without study. You must employ a landscape gardener, of course.

The foregoing is a sample of the practical character of the "Supplement," which is full of valuable hints and carefully digested observations, drawn from extended experience in laying out and adorning an enchanting and almost fairy scene.

Of the value of the notes on trees and shrubs we may speak hereafter; suffice it now to say, that the learner will here find a guide that will make the work indispensable as a manual.

The historical notices, of which there are two too brief chapters, are capital; we are told much in few words, but those words have each a meaning.

The New York Park, and Llewellyn Park, at Orange, N. J., receive notices which will add much to the reader's appreciation of their merits; there are several engravings of each; from these we select, to show their quality, two views of Central Park, - one exhibiting the original condition of the ground, and the other the contrast of what it is to be.

On the subject of acclimation of plants there are a few observations that embrace the whole topic in a nutshell, which" we shall present in these pages hereafter.

We agree with Mr. Sargent when he says: "Take it all in all, we consider the Mahonia, sometimes called Berberis Mahonia, the most valuable of all shrubs, deciduous or evergreen," and we add that the Mahonia Japonica has proved this winter to be hardy, affording a long-sought desideratum among us, a broad-leaved evergreen shrub.