MUSHROOM GROWING 



are upwards of 2,000 kilometers (about 1,200 

 miles) of mushroom beds (Plate IP, d). 

 In the caves of the suburbs mushrooms are 

 so commonly grown that ^^ champignoniere^ 

 (mushroom cave) is practically synonymous 

 with '' carrier e" (cave). The cave systems 

 are very well ventilated by means of chim- 

 neys or chutes. The change of air is often 

 facilitated by small charcoal fires beneath 

 these air chutes and occasionally by the use 

 of special ventilating devices. 



Entrance to the champignojiieres may be, 

 on the one hand, through an open quarry 

 more or less readily accessible, or it may be 

 through a hole only a few feet or more in 

 diameter by means of a ladder, with a wind- 

 lass for lifting or lowering materials. It 

 may be added that in England mushrooms 

 are grown either in specially constructed 

 houses, in cellars, or in caves, and sometimes 

 even in the open air, — usually protected 

 more or less, as described later. 



In the United States. The production is 

 thus far wholly confined to special houses, 



34 



