16 
MUSHROOMS, HOW TO GROW THEM. 
ing it should be made as warm as possible with double 
windows, and double doors, where the entrance is from 
the outside, but if from another building single doors 
will suffice. A chimney-like shaft or shafts rising from 
the ceiling should be used as ventilators in winter, when 
we can not ventilate from doors or windows; indeed 
side ventilation at any time when the beds are in bearing 
condition is rather precarious. There should be some 
indoor way of getting into the cellar, as by a stairway 
from the building above it. Also an easy way of getting 
in fresh materials for the beds, and removing the ex¬ 
hausted material. This is, perhaps, best obtained by 
having a door that opens to the outside, or a moderately 
large one from the building above. 
Fig. 1. Mushroom Cellar under a Barn. 
The interior arrangement of the cellar is a matter of 
choice with the grower, but the simplest way is to have 
beds three or four feet wide around the inside of the 
walls, and beds six feet wide, with pathways two, or two 
and one-half feet wide between them running parallel 
along the middle of the cellar. Above these floor-beds, 
shelf-beds in tiers of one, two, or three, according to the 
