10 



MUSHROOM CULTURE. 



of the house 3 feet wide, for a double flue and a walk 

 upon it."" Hot-water pipes were not in use when this 

 house was erected. "The walls should be 9 inches 

 thick, and the length of the house as may be judged 

 necessary. When the outside of the house is built, 

 place a ceiling over it (as high as the top of the walls) of 



Fig. 10. Russian mushroom-house. 



boards 1 inch thick, and plaster it on the upper side 

 with road sand well wrought together, 1 inch thick, 

 (this will be found superior to lime), leaving square 

 trunks, /, in the ceiling 9 inches in width, up the 



