The Mushroom, in a natural state, is very generally distributed over many of the more temperate parts of the world. The species that is most commonly accepted is the Agaricus campestris of botanists - a cryptogamic plant of the natural order Fungi. That part made use of, and which develops itself above ground, is the fructifying organs, the real and true plant being beneath the surface, in the form of delicately reticulated and slender, white threads, that traverse very rapidly any matrix which is conducive to their welfare. It is an edible that is almost universally relished, although we cannot say much in favor of its nutritive properties; it may be either made up into a dish for the table, used as a flavoring in many kinds of cookery, compounded into catchup, or preserved in pickle. In all cases, there is a fine, savory taste imparted to whatever it accompanies.

Considering the great request for Mushrooms, it is not a little singular that the cultivation of them is not more generally understood; more particularly so, as they neither require an extent of garden ground, nor yet the influence of the sun's rays, to bring them to perfection. Any person who has got a good cellar that is free from frost, may grow them through the winter; and at other seasons nothing is needed but a closed-in shed, or, in a small way, a few boards nailed together in the form of a Λ cover, to keep off heavy rains and drying winds. Such conveniences are enough to supply any ordinary family, but when a great quantity and uninterrupted succession is wanted, it becomes necessary to erect a house for the purpose. In such case, a double-span roofed shed, some ten feet wide, and in length according to the demand, is the best adapted, and most economical. The framework of this may be built with common spars, the roof shingled, and the whole double-boarded, with the between casings filled with shavings, sawdust, or, still better, powdered charcoal.

Such a structure is similar to an above-ground ice-house, than which nothing can be more suitable, as it serves the double purpose of keeping out the extreme heat of summer, and the cold of winter, both of which are preventives to success. On each side (inside the house), there ought to be two or three heights of shelves, about four feet wide and three feet apart, with a board ten inches wide, placed in front of each, for the purpose of making so many beds as succession crops. Notwithstanding this contrivance, it is requisite during very severe weather to have some artificial heat, which is sometimes supplied by a common flue placed along the ground, level, and in the middle of the house; but as there is some danger attending this, and the warmth therefrom is of a very drying nature, it is better to fix the lower shelf about three feet high, and, when required, to keep the under space filled with fresh, fermenting, and somewhat dry stable manure, and the droppings as below described, which will give out enough heat and genial moisture to raise the temperature sufficiently.

Where expense is not an object, and there is a regular arrangement of houses for the forcing of vegetables in the winter, the Mushroom house may form a part of the whole; and if hot water is employed for heating, a pipe may be introduced into it, which is certainly the most cleanly and perfect mode.