28 
MUSHROOMS, HOW TO GROW THEM. 
end are given up to entrance pits and a heating appara¬ 
tus ; and the full length of the mushroom cellar proper 
inside the inner walls is sixty-three feet. The walls and 
arch are of brick, and the top of the arch is two and 
one-half feet below the surface of the soil. This tunnel 
or arch is seven feet high in the middle and eight feet 
wide within, but a raised two-feet-wide pathway along 
the middle lessens the height to six and one-half feet. 
Between this pathway and the sides of the building there 
is only an earthen floor, but it is quite dry, as the cellar 
is perfectly drained. Three ventilators sixteen feet 
apart had been built in the top of the arch, but this was 
a mistake, as the condensation in the cellar in winter 
from these ventilators always keeps the place under them 
cold and wet and rather unproductive. One tall wooden 
chimney-like shaft would have been a better ventilator 
than the three ventilating holes now there, which are 
covered over with an iron and glass grating. 
At one end of the house and behind the stairs descend¬ 
ing into the pit is the heating apparatus, from which a 
four-inch hot-water pipe passes around inside the house 
Fig. 4. Ground Plan of the Dosoris Cellar. 
near the wall and only four inches above ground. A 
three-feet wide hemlock flooring for the bed to rest on 
is laid along each side and about four inches above the 
pipe, leaving the aperture between the earth floor and 
the bottom of the bed along the pathway open for the 
