GEOWING MUSHROOMS IN MUSHROOM HOUSES. 35 
of the house. At the same time, do not lose sight of 
convenience in handling the manure, either in bringing 
it into the house or taking it out, and with this in view 
it may be necessary to have a door opening to the out¬ 
side. All outside doors should be double and securely 
packed around in winter. Side window ventilators are 
not necessary, at the same time they are useful in the 
early part of the season and in summer time; they 
should be double and tightly packed in winter. The 
walls, if made of brick, should be hollow, if of wood, 
double; indeed, walls built as if for an ice house are 
the very best for a mushroom house, and should be 
banked with earth, tree leaves, or strawy manure in 
winter, to help keep the interior of the house a little 
warmer. 
The floor should be perfectly dry; that is, so well 
drained that water will not stand upon it, but it is 
Fig. 8. Section of Mrs. C. J. Osborne’s Mushroom House. 
Immaterial whether the floor is an ordinary earthen one 
or of wood or cement. 
The roof should be double and always sloping,—never 
flat. The hoar frost that appears in severe weather 
inside a single roof is likely to melt as the heat of the 
