==Indoor Beds.==—­Mushrooms may be grown almost anywhere, evenly in a cellar, or on the wall of a warm stable, provided only that the mode of procedure is in a reasonable degree adapted to the requirements of the fungus.  Ordinary pits and frames are also serviceable, and many gardeners obtain good crops in autumn by the simple process of inserting a few lumps of spawn in a Cucumber or Melon bed while the plants are still in bearing.  Between spawning and cropping a period of six or eight weeks usually elapses, so that if the plan just mentioned be adopted, the spawn should be introduced in the height of summer, both to insure it a warm bed and to allow time for the crop to mature before the season runs out.  Sheds and outhouses not only afford shelter and space for beds on the floor, but the walls can be fitted with shelves on which Mushrooms may be plentifully grown.  In all cases the shelves should be two feet apart vertically, and each shelf should have a ledge nine inches deep.  The walls of a house may be quickly and cheaply fitted with woodwork for the purpose, but brick is so much better than wood that whenever it is possible to employ brick it should have the preference.  As regards the ledges, they should be of stout planking in any case, and should not be fixed, because of the necessity for clearing the shelves and renewing the soil periodically.  The details of cultivation are the same within doors as without, but the roof gives valuable protection, and helps to maintain the beds at a suitable temperature.

==A proper Mushroom-house== for production during winter should be heated with hot water, and have an opaque roof.  There is nothing so good for the crop as a roof of thatch, but there are many objections to it, and usually slate is employed.  A double roof will pay for its extra cost by promoting an equable temperature.  A few side lights fitted with shutters are necessary, as there should be a good light for working purposes; but the crop does not need light, and a more steady temperature can be maintained in a dark house than in one which has several windows.  The most convenient dimensions for a Mushroom-house are:  length, twenty-five feet; width, twelve feet; height at sides, six feet, to allow of a bed on the floor, and a shelf four feet above it; the ridge rising sufficiently for head room, and to shoot off water.  There will be room for a central path of four feet, and a bed of four feet on each side.  An earth or tile floor and a slate or stone shelf will, with one four-inch flow and return pipe, complete the arrangements.  The less wood and the less concrete the better; there is nothing like porous red tiles for the floor and stone for the shelves, with loose planks on edge to keep up the soil, a few uprights being sufficient to hold them in their places.

==Temperatures== at every point are of great importance.  The bed should be near 80 deg. when the spawn is inserted.  The air temperature requisite to the rising crop is 60 deg. to 65 deg., which is the usual temperature of the season when Mushrooms appear in pastures.  While the bed is bearing a temperature of 55 deg. will suffice, but at any point below this minimum production will be slow and may come to a stop.  When giving water, take care that it is at a temperature rather above than below that of the bed.