We know of over a thousand lineal feet erected in this way for the exotic grape alone, which is all heated throughout with hot water; and as to the general appearance, there are hundreds of houses that have cost over twelve and fourteen dollars per foot, that look no better, if they look as well. Houses should be built strong; if rough, you can dispense altogether with the carpenter's plane; it is a very expensive tool.

Our next suggestion is in reference to the form of the house. The span roof I think will be found best adapted to this purpose. The great question, however, is, How are we to grow these fruit trees? How is labor to be saved? In England this is no question of importance, but in America it is a very serious one, with the private establishments as well as the commercial gardens. In the first place I should use no pots at all; use boxes. They do not attract the heat like the flower pot, and consequently they will take much less watering. I have grown vines from eyes in boxes and pots side by side, the pot containing three times the amount of soil that was held by the box, but the box invariably made three times the amount of wood or cane. It makes quite a difference to a plant whether its roots cling to the side of a roasting hotpot, or a cool moist board.

And it makes also a great difference in the producing of red spider, bug and scale, and a whole host of these detestable, ever-tantalizing little pests to horticulture. But if these fruit trees are to be grown for a commercial purpose, we say, use neither pots nor boxes. Plant out; - now inplanting out we don't wish to be understood that the borders must be large vine borders, but they may be made two feet wide by eighteen or twenty-four inches deep, or so constructed as to suit the house. It is not a great bulk of soil that plants live on, but the element they suck up from it, and the less the quantify of soil the plant has to live in, and feed from, the greater is the amount of mouths or feeders or roots they will throw out in search of their required support; and if you keep your little borders well mulched (top dressed) with good decomposed manure, and constantly pour over that mulching guano water, there is no fear of the plant troubling itself much about the bulk of soil you have given it to grow in.

As a proof of this, we will give you a fact in connection with this mode of culture. We know a small house one hundred and two feet long, a lean-to, in the front and back of which was run a lot of common boards that made a sort of trough about two feet wide and deep the whole length, and this was filled in with soil, in May 1st, 1857, and then was put in young vine eyes just beginning to grow, and they were planted one foot apart. In the following May, 1858, we saw the whole house full of ripe fruit, the bunches weighing from three quarters to a pound and a quarter each; this season was cut the second crop off these same vines, March 20th, 1859. The,fruit cut from one vine we had the curiosity to see weighed, - it weighed over ten pounds; and four of the bunches weighed one and a half pounds each; one bunch two pounds; and the whole of the fruit was well colored and well swelled. Now we could not begin to do anything like this in pots; in fact it would be folly to attempt it.

The next question we have to think about is, the sorts of fruits adapted for the Orchard House, and this question will not take much time to answer, nor much space in your valuable journal; for we know no fruit that cannot be induced to pay due respect for its protection and care. Perhaps, above all, the plum would feel doubly dutiful for protecting it from the ravages of the curculio. The peach, apricot, nectarine, and plum, can. and will be grown to perfection; but we must not be satisfied with the dozen - we must and will have them by the thousand.

So great is the demand for fine fruits of all kinds in the great city of New York, that some of the prices paid are almost fabulous, and fruits of the highest character are now daily standing dishes on the tables. Ere long we shall see the pine-apple grown here for the public markets to a much greater extent and perfection than is now done in Europe. What a glorious sight will be the Fruit Palace of America, with its noble centre, glowing with its golden pine-apples, and the sweet honey-dew dripping from its luscious cheek. Soon will the difference of quality be appreciated; soon will it be found that the imported pine-apple is as different from the home cultivated one as the Bartlett pear is from the Swedish turnip. They must and will be grown for sale. Peaches are sold in Broadway at a dollar each when those from the South command no more for a whole basket full, and the ladies that promenade that great thoroughfare know pretty well that all the black grapes are not Black Isabellas. The first bunch of Hamburgs that was ever offered in New York was sold with difficulty at twenty-five cents per pound; now, at the same season of the year, they will command two dollars.

Four years ago grapes could be sent from Boston called Black Hamburgs, red as foxes, with mealy bugs running all over the bunches as they hung in the windows, apparently frightened to death at their new quarters; but to-day, Mr. Editor, those same fruiterers say, Keep your red grapes and white bugs at home, - and at last we see them in Washington Market, left at some vegetable stall to be sold on commission. Should you chance to walk into some of the fruit stores in Broadway to buy a bunch of grapes, you must not feel surprised if the bunch of Hamburgs or Muscats should weigh five pounds, Royal Muscadine two, and White Frontignan three pounds. Yes, sir, we may stare at the grapes, but they are in the scales - we can't deny it - and they are plentiful enough, too.

How to grow or how to train trees for the Orchard House, is another point that we shall have to talk a little more about shortly, in detail; but for the present we say that if the amateur wishes to grow them in boxes, he may adopt the finger and thumb system of pruning, - the same, in fact, that he practises on his specimen plants in the greenhouse or stove. By constant stopping, after beginning properly, any form can be given to the trees that may be desired, and at the same time made productive. The great demand for fine fruits in the city of New York alone will cause large numbers of orchard houses to be soon erected. The cry is, Where can we buy peaches, plums, nectarines, and apricots? We shall soon see acres of glass erected for this purpose, and still the cry will be, give us more. Grapes under glass are at the present the only fruit that is generally in cultivation; but there are many other fruits that equally demand the attention of the commercial gardener, which would be as productive and profitable.

Strong, rough, tight, well ventilated, cheap houses, is what is required here, made tight to keep out the frost, whitewashed to keep out the sun, (the glass in winter), employ small, shallow borders for the roots, plenty of ventilation or air, plenty of liquid manure, plenty of determination to accomplish the end, and you will find plenty of success.