GR0WIXG MUSHROOMS IX GREEXHOUSES. 
45 
of the mushroom bed, no matter how hot or cold the 
atmosphere of the greenhouse may be. In the same 
way-—by shading the panes or unshading them—he gov¬ 
erns the light admitted to the mushrooms. 
The greenhouses in which the mushrooms are grown 
are orchard houses, that is, glasshouses in which peach 
and nectarine trees are grown and forced. As these 
trees fruit and finish their growth early, it is necessary 
that they be kept as cool and inactive as possible in the 
fall and early winter, and started again into growth in 
late winter. In the fall, therefore, the fermentin'g ma¬ 
terial being confined in frames retains warmth enough 
for the proper development of the mushrooms, and as 
Fig. 14. Mushrooms on Greenhouse Benches under Tomatoes. 
the winter advances and the heat in the frames begins to 
wane it becomes necessary to begin heating the green¬ 
houses in order to start the trees into bloom and 
growth, and thus are provided very favorable conditions 
for the continued production of the mushroom crop. 
The frames used are common hotbed box frames seven 
