MUSHROOM GROWING 



four or five should be scantling not less than 

 2x6 inches, and these should be placed 

 about 4 feet apart. Experienced commer- 

 cial growers are now using large gas piping 

 for the supports (Plate III, b), and these 

 have, of course, the advantage of great per- 

 manency, and they are perfect also from a 

 sanitary standpoint. Wall beds should sel- 

 dom be more than 3 feet across, but beds 

 approachable from either side may be 6 

 feet across. Ample space should be left for 

 the aisles, 3 feet, however, being usually 

 sufficient. One or more wider aisles may 

 be employed where the houses are very 

 large, but, as stated above, everything de- 

 pends upon convenience in the installation 

 and removal of beds. In general, it may 

 be stated the exact form of the house, ma- 

 terials to be used, the method of heating, 

 and all such details will depend entirely 

 upon conditions. Have in mind always the 

 purpose for which the house is used and the 

 conditions to be maintained. 



Open air culture. In Southern England 



40 



