TEMPERATURE, MOISTURE, LIGHT 



the cultivated mushrooms. Sunlight is, of 

 course, accompanied by heat, and where the 

 sun shines directly into a window, the tem- 

 perature is appreciably raised. In cellars, 

 therefore, which admit the sunlight through 

 many windows, the temperature factor 

 might be variable, and, during bright 

 weather, too high for successful work. If 

 the temperature can be regulated, light can 

 do no harm. It is clear that the "injuri- 

 ous" effects of light on mushrooms under 

 glass is wholly a matter of temperature. 

 Mushrooms can be, and, indeed, are grown 

 in greenhouses, both under the benches and 

 on the benches, under proper conditions of 

 temperature and moisture. 



69 



