=Volunteer mushrooms in greenhouses.=--Volunteer mushrooms sometimes appear in greenhouses in considerable quantity. These start from natural spawn in the manure used, or sometimes from the spawn remaining in "spent" mushroom beds which is mixed with the soil in making lettuce beds, etc., under glass. One of the market gardeners at Ithaca used old spawn in this way, and had volunteer mushrooms among lettuce for several years. In making the lettuce beds in the autumn, a layer of fresh horse manure six inches deep is placed in the bottom, and on this is placed the soil mixed with the old, spent mushroom beds. The following year the soil and the manure at the bottom, which is now rotten, is mixed up, and a fresh layer of manure is placed below. In this way the lettuce bed is self-spawned from year to year. About every six years the soil in the bed is entirely changed. This gardener, during the winter of 1900--1, sold $30.00 to $40.00 worth of volunteer mushrooms. Another gardener, in a previous year, sold over $50.00 worth. =Planting mushrooms with other vegetables.=--In some cases gardeners follow the practice of inserting a forkful of manure here and there in the soil where other vegetables are grown under glass, and planting in it a bit of spawn. =Mushroom and vegetable house combined.=--Some combine a mushroom house and house for vegetables in one, there being a deep pit where several tiers of beds for mushrooms can be built up, and above this the glass house where lettuce, etc., is grown, all at a temperature of about 60° F. THREE METHODS SUGGESTED FOR GROWING MUSHROOMS IN CELLARS AND SHEDS. =First Method.=--Obtain fresh stable horse manure mixed with straw used in bedding the animals. Shake it out, separating the coarse material from the droppings. Put the droppings in a pile two to three feet deep. Pack down firmly. When the heat rises to near 130° F., turn and shake it out, making a new pile. Make the new pile by layers of manure and loam soil, or rotted sod, one part of soil to eight or nine parts of manure. Turn again when the heat rises to near 130° F., and add the same amount of soil. When the temperature is about 100° F., the material is ready for the beds. =Preparing the beds.=--Make the beds as described under the paragraph on pages 250--253, or use boxes. Place the coarse litter in the bottom three to four inches deep. On this place three to four inches of the cured material, pack it down, and continue adding material until the bed is ten to fifteen inches deep. Allow the beds to stand, covering them with straw or excelsior if the air in the cellar or shed is such as to dry out the surface. Test the moisture content according to directions on page 255. Watch the temperature. Do not let it rise above 130° F. When it is down to 90° F. or 70° F., if the manure has a "sweetish" or "mushroomy" smell it is ready to spawn.