MUSHROOM GROWING 



in heating, as well as for more uniform tem- 

 perature considerations during the warmer 

 parts of the season, it is often convenient to 

 construct the house over an excavation 

 which may be at least several feet lower 

 than the natural surface. In building 

 houses of this type, however, arrangement 

 should be made for the utmost convenience 

 in unloading the compost and for cleaning 

 out the old beds. The greatest economy is 

 attained by the construction of houses high 

 enough to accommodate the beds in tiers 

 of from two to five. 



It is necessary to allow about 2-2j4 feet 

 free space between the beds in tiers, since 

 the bed is at least 8 to lo inches deep; some- 

 what more than 3 feet in height must be 

 allowed for each bed. For some time it 

 has been the custom in building the better 

 class of mushroom houses to make the walls 

 double, and to pack fresh shavings between 

 these. More expensive houses may be made 

 of hollow tile or concrete. Hollow tile has 

 much to recommend it where the outlay is 



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