(D. P. B., College Hill, Ohio.) The most satisfactory mode of forming a plantation for shelter or screens of the kind you mention, is to plant an irregular-formed strip inside the boundary line, varying from ten to forty feet in width, and setting it quite thick with young trees, chiefly evergreens. In the first place, let the ground be well broken up by deep and thorough ploughing, and, if possible, subsoiled. Procure trees of a small size - say from one foot to eighteen inches in height - and plant from three to six feet apart; this will give a satisfactory and speedy growth. The most suitable evergreens for this purpose are the White and Austrian Pines, Norway, Balsam, and Scotch Firs, American Arbor-Vita, and Hemlock Spruce. It will be advisable to plant about one-third of the number deciduous trees, such as any of the free-growing Poplars, Maples, Willows, Larch, etc. These can be thinned out as the evergreens grow up.

In planting, set similar kinds in small groups, which will produce a better effect. Of course, the individual beauty of trees cannot be developed by this mode, unless they are carefully thinned out as they increase in size. The advantages of this method of planting are many; the plants being young, will grow at once with vigor, and they can be procured at a low cost at any of the wholesale nurseries. Without a plan of your grounds, we cannot be more definite. We would, however, advise you (and we would extend the advice to all who are about improving) to prepare a rough plan and description of your place, and inclose it in an envelop addressed to William Saunders, Landscape Gardener, Germantown, Pa., who, by his writings in these pages, and by his operations in various parts of the Union, has shown himself to be a master of his art.

A. McClintock wishes to have a hedge of Arbor-Vitae both thick and high. This will not be exactly as difficult as the case of the boy who wished to eat his cake and keep it also; but it will require a little time. Cut back every June and September, leaving the tops at each clipping a little longer than at the previous one, and in a very few years we can promise you one of the most practicable hedges known to planters; its only disadvantage is, that it is brown in winter. Like all others, it demands regular attention. If one could live a century or so, a hemlock hedge would be a more desirable thing.

Answers To Correspondents #1

Geo. M. Brown - The "Turk's cap" cactus - Mela cactus communis - is, we believe, sometimes called "Pope's Head," though it is unusual for it to branch out in the way you describe yours to do. We could not name it from your description. Cactuses, to bloom well, require a season of growth, and one of rest. It is a good plan to set them out in the open air about May; give them a liberal supply of water for one. or two months, then gradually dry them off for winter, and they will well reward you. A Cereus multangularis, and C. Peruvianas, annually bloom, thus treated, in our garden.

James Moore: In propagating from unripe shoots, either of the vine or of any plant, bottom heat is of great advantage, and in many cases essential to success. If the cuttings can be so placed, as not to have too great a heat at first, say about 55°, and after a week or ten days increased to 60°, and so on to 65° or 70°, they are more certain to strike than when kept in a uniform heat. Any sharp fine sand, washed so as to have any impurities it may contain separated, is as good as silver sand for striking in. - Ed].

Answers To Correspondents #2

(Mango.) It was Washington Irving, In Salmagundi, who gave the derivation of " mango:" " My cousin, Cookloft, was once nearly annihilated with astonishment on hearing Jeremy trace the derivation of mango from Jeremiah King; as Jeremiah King, Jerry King, Jerkin, gherkin, cucumber, mango".

Frigi Domo is a canvas made of patent prepared hair and wool - a perfect non-conductor of heat and cold, thus keeping a fixed temperature. Its cost in London is 1*. 8d. per yard run, and two yards wide; and to give our inquirer a clue to import it, Elisha Thomas Archer, 7 Trinity Lane, Cannon St., city of London, is the vendor. In England, it is used without glass. We trust some one will introduce it here.

(John A. Townley.) The Taxus Canadensis makes a beautiful spreading shrub, and bears the shears well; but it will never rise to more than four or six feet high.

(J. B. Roe.) If you will observe the growth of a tree for one season, you will find the answer to your question will be "No /"

(H. A. Terry, Crescent City, Iowa.) Tour plant is the Clematis Virginiana. We are glad to find this beautiful native vine attracting such general attention.