GROWING MUSHROOMS IK GREENHOUSES. 45 



of the mushroom bed, no matter liow 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 peiicli 

 and nectariae 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 fermenting ma- 

 terial being confined in frames retains warmth enough 

 for the proper development of the mushrooms, and as 



Fig. 14. Mushrooms on Greenhouse Benches undek 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 



