CHAPTER III. 
GROWJKO MUSHROOMS IK MUSHROOM HOUSES. 
A mushroom house is a building erected purposely for 
mushroom culture. It may be wholly or partly above 
ground, and built of wood, brick, or stone, and extend 
to any desired dimensions. But a few general principles 
should be borne in mind. Mushrooms in houses are a 
winter and not a summer crop, and they are impatient 
of sudden changes of temperature and of a hot or arid 
atmosphere. Therefore, build the houses where they 
will be warm and well-sheltered in winter, so as to get 
Exg. 7. Mushroom House built against a North-facing Wall. 
the advantage of the natural warmth, and spare the arti¬ 
ficial heat. They should be entered from an adjoining 
building, or through a porch on the south side, so as to 
guard against cold draughts or blasts in winter when 
the door would be opened in going into or coming out 
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