_Mushroom Beds._--Prepare a bed in the corner of the hothouse, or, in the absence of that, in a warm, dry cellar. The first of October is the best time. Make the bed four feet wide, and as long as you require. It should be one foot high perpendicularly at the edges, and sloping toward the middle; it should be of horse-manure, well forked, and put in compact and even, so as to settle all alike. Cover it with long straw, to preserve heat and the exhalations that would rise. At the end of ten days, the heat will be such as to allow you to remove the straw, and put an inch of good mould over the top of the bed. On this put the spawn or seed of the mushroom, in rows of six inches apart. The spawn are white fibres, found in old pastures, where mushrooms grow, or in old spent hotbeds, and sometimes under old stable floors. The warmth of the bed will produce mushrooms plentifully for a considerable time. If the production diminishes and nearly ceases, it may be renewed by removing the mould, and putting on good horse-manure to the depth of twelve inches, and covering and planting as before, and the production will be plentiful for a number of weeks. MUSTARD. There are two kinds cultivated, the black and the white, annuals, and natives of Great Britain. The white mustard is cultivated in this country principally for greens, and sometimes for a small salad like the cress. It may be sown at any time from opening of spring to the beginning of autumn. But sown in hot weather, the bed must be shaded. The Spaniards prefer the white mustard for grinding for table use, because of its mildness and its whiter flour. White mustard-seed, being much larger than the black, is preferred for mangoes, and all pickling purposes. Black mustard is cultivated principally in the field, for the mills. It is there ground, and makes the well known condiment found on most tables. Sow in March or April, broadcast on land tolerably free from weeds, and if you get it too thick, hoe up a part. In July or August, you may get a good crop. Cradle it as wheat, before ripe enough to shell. Mustard used in various ways is medicinal. It is one of the safest and most speedy emetics. Stir up a table-spoonful of the flour and drink it. Follow it with repeated draughts of warm water, and in half an hour, you will have gone through all the stages of a thorough emetic, without having been weakened by it. NASTURTIUM. This annual plant, found in most gardens, is too well known to need description. Were it not so common, its flowers, that appear in great profusion, from early summer till destroyed by frost, would be regarded very beautiful. Its main use is for pickles. Its green berries are nearly equal to capers for that purpose. It grows well on any good garden soil; bears more berries on less vines, planted on land not too rich. Single vines four feet apart, on rich land, do best. NECTARINE.