_Mushrooms_ are generally grown in the back shed of a vinery or forcing-house, in beds made of fresh horse-dung, which has lain in a heap under cover, and been turned over several times for about a fortnight or three weeks, till every part has thoroughly fermented. A bed is then marked out about twelve or fourteen feet long, and five feet broad; and, if it is on the earth, a pit is made of that size by taking out the soil about six inches deep. The bottom of the bed should be formed by a layer of long fresh stable manure about four inches thick. On this several other layers must be placed of the prepared dung, each being beaten flat with the fork, so as to make the bed as close and compact as possible, till it is about five feet high, when the top should be finished off like the ridge of a house. In this state the bed should remain about a fortnight, and then some bricks of mushroom spawn having been procured from a nurseryman, they should be broken into pieces about an inch or an inch and a half square, and strewed regularly over the bed, each piece of the spawn being buried by raising up a little of the dung and inserting it. After this, the surface of the bed must be beaten flat with the spade, and the whole covered with a loamy soil, and beaten quite smooth. The bed is then covered about a foot thick with oat straw, and again with mats, and it will require no further care for a month or six weeks, by which time the mushrooms will be ready for the table. Care should be taken in gathering them to twist them up by the roots, as, if they are cut off, the root, which is left in the ground, will decay, and be injurious to the young plants. Mushrooms may be made to grow in lawns, by procuring some bricks of mushroom spawn, and, after breaking them into pieces about an inch or two inches square, burying these pieces by raising a little of the turf wherever the mushrooms are wished to grow, and placing the spawn under it. This is sometimes done in April or May; but if the season should be dry, the spawn will not germinate. Others put the spawn into the ground in August, or in the first week in September; the lawn is afterwards rolled, and no other care will be requisite until the mushrooms are ready for gathering, which will be in a month or six weeks after the spawn is buried. LETTER XI. THE MANAGEMENT OF FRUIT TREES.--PLANTING.--PROTECTING THE BLOSSOMS.--STONE FRUITS.--FIG TREES.--GRAPES.--MANAGEMENT OF A VINERY.--GROWING PINE-APPLES.--FORCING PEACHES AND NECTARINES.--STANDARD FRUIT TREES.--KERNEL FRUITS.--FRUIT SHRUBS.--STRAWBERRIES.--TART-RHUBARB.