Very few gardeners would be guilty of so foolish a thing as to waste barn-yard manure. But they are almost all guilty of a waste not a whit less excusable. We mean the waste of dead leaves that fall at this season of the year, from trees and shrubs of all kinds. If every horticulturist would reflect for a moment on the nature of these fallen leaves - which contain not only the vegetable matter, but the earthy salts, lime, potash, etc., needed for the next season's growth-and that too, exactly in the proportion required by the very tree or plant from which they fall - nay more, if they would consider that it is precisely in this way, by the decomposition of these very falling leaves, that nature enriches the soil, year after year, in her great forests, it would scarcely be possible for such a reflecting horticulturist to allow these leaves to be swept away by every wind that blows, and finally be lost altogether.

A wise horticulturist will diligently collect, from week to week, the leaves that fall under each tree, and by digging them under the soil about the roots, where they will decay and enrich that soil, provide in the cheapest manner, the best possible food for that tree. In certain vineyards in France, the vines are kept in the highest condition by simply burying at their roots every leaf and branch that is pruned off such vines, or that falls from them at the end of the season. In the same manner, the leaves that fall from young fruit trees should be carefully saved and dug-in beneath the surface of the soil. A single year's experience of its good results will confirm our readers in this practice. -------Sous Autumn Hints. - Dear Sir: I send you a few hints for the management of the garden in autumn, which may perhaps be useful to your readers.

1. Carnations

A frame of boards - an old hot-bed frame covered with glass and a few boards, is all that is needful to keep Carnations through the winter. The plants should be taken up - the new layers I mean, and carefully potted in a mixture of old decomposed manure, sand and loam; the pots set on some coal ashes spread over the bottom of the bed. So long as the weather is warm and mild, give a good supply of water whenever the soil in the pots appears the least dry, and keep the frames open. When the frost sets in, water more sparingly - but give air as often as you can. During the winter, keep the glass covered with boards for a good part of the time - especially if the soil in the pots is frozen. The great point is to keep the plants perfectly dormant and quiet during the winter, and for this purpose you only open the bed to the sun when the weather is fine, and there is not a particle of frost in it - all the rest of the time you keep it shaded well with boards, admitting the air in at one end - or both ends. As spring opens, you gradually open the plants to the sun, and commence giving them more water. About the 10th of April you plant them out in the bed where they are to bloom.

I ought to add to this simple practice, that the rats and mice are very fond of Carnations, and it will be wise to keep a little arsenic and meal on boards, at the bottom of the beds, that they may get their deserts.

2. Dahlias - Many lose their Dahlias from too much care in preserving the roots. The following is my mode, pursued with success for years. I take up the plants as soon as the frost has blackened the tops choosing a clear windy day for the purpose. I cut off the stalk an inch above the surface of the ground. After the roots are taken up, carry them to an airy loft or out-building, where they will be secure from frost for several days. Here allow them to stand quite separately, till the particles of soil that may adhere to them appear perfectly dry; better still if the the roots are turned over once, so as to become ripe and dry on all sides. Then take them into a dry cellar that will keep potatoes well, and lay them in a single tier on a floor, or on shelves, covering the roots lightly with dry tan.

3. Manuring Fruit-Trees

This is the season for the amateur to look over his fruit trees - especially those which have failed to produce good crops for want of nourishment in the soil. Carefully open a trench at the very ends of the roots - throw out a third of the poorest of the soil, and replace it with a mixture of manure and ashes. I use a cart load of barn-yard manure - no matter if it is fresh - to a bushel of ashes, and I find it never to fail in bringing up the tree. If I wait till spring before I apply this stimulus - I find it to do just half as much good as if I put it in the soil in October and November. It is quite surprising how old fruit trees can be brought to by this simple dressing - barn-yard manure and ashes, applied in the fall of the year. Some persons are too indolent to do it, but I think I can prove to them that it will "pay." On one side you have an enfeebled tree; it bears a peck of poor fruit, half of which is not fit to take to the table. It costs you nothing per an-num - profit about equal to cost.

On the other side you have the same tree - you give it two cart loads of manure - two bushels of leached ashes - once in three years, cost one dollar - and cultivators of the native grapes suffer from the "rot" - a disease that makes its appearance by a small discolored spot on the hemes, that frequently spreads till it des-troys the whole bunch, and sometimes greatly injures the entire crop, I beg leave to say that this disease is capable of being kept under by careful hand-picking.

Having been more or less troubled by the the appearance of this disease in my vineyard for several summers past, I ventured to attempt to eradicate it by the following means. As soon as the rot season commenced - say the first of July, I employed a man to go carefully over the vines, and with a small pair of scissors, cut out every bunch that was in the least degree affected. These grapes were taken and buried in a lime heap - where I got them out of the way, and will I trust, turn them into compost. The man spent a morning every week in going over my vineyard of two acres, and the cost of his time so employed is exactly six dollars and fifty cents. Per contra - I have few or no bunches with the rot in my vineyard - on the other hand, I have an excellent crop of fine grapes - while my neighbors, who have only trusted to providence and the season, are much afflicted with the rot. If you think this experiment of any value, the foregoing is at your service. An Ohio Reader.