LAYERING. This is a method of propagation, by bending down a branch, and fastening it under the soil, leaving the upper end projecting, until it takes root. Cut half way through the branch so as to raise the top, and fasten it at the point where it is cut, in a trench, with a stick thrust into the ground over it nearly horizontally, or with a stick having a hook made by cutting off a limb. Cover well with soil, and mulch it, and water when dry. This done in the spring, in August the branch will be well rooted, and may be cut away from the parent stalk. This is important in any tree or shrub (like the snowball), difficult to propagate by slips or grafting. LAYING IN TREES. Dig a trench where water will not stand, and lay the trees in at an angle of forty-five degrees, and cover the roots and lower part, very closely, with earth. In this way they may be well preserved through the winter, if buried so deep that the tap-root will not freeze, which is always injurious to trees that have been removed from their original soil. Such freezing is always destructive to trees out of the ground. Small trees and seedlings may be covered entirely, to be kept through the winter. Put coarse straw manure on the earth, over trees large enough for setting, that are to be preserved heeled in during winter; and straw or corn-fodder over the tops, during the coldest weather, and they will come out perfect in the spring. If not ready to set out your trees at once, you may preserve them in perfect condition to very late in spring, in this way, by raising them once, to check vegetation, and putting them back, and shading their stems and mulching the roots, after the commencement of warm weather. Trees may thus be preserved in better condition for transplanting than those left in the nursery, and they will make a larger growth the first season. LEEKS. These are said to be natives of Switzerland. We think this doubtful, as they are an article of daily food in Egypt, and were so highly esteemed there, centuries ago, as to become an object of worship. They are used as a pot-herb, to give a flavor to soups and stews. They are not bulbous, like onions, but have a long stem, which is principally used. They are transplanted very deep, so as to obtain a long white neck. The ends of the roots are to be cut off when transplanted, and they should be set in rows a foot apart, and from four to six inches in the row. There are several varieties, distinguished mainly by the width of the leaves,--the _Flanders_ (or _narrow-leafed_), the _Scotch_, and the _Broad London_. We know no use of leeks for which onions would not be equally good, and, hence, do not recommend their cultivation. LEMON. This is the finest acid fruit grown, and belongs to warm climates; but by getting good budded trees from the South, and setting in glass-houses, protected from severe frosts, we may grow lemons in abundance at the North.