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Abstract: Finland, Sweden, Norway, Denmark, Holland, Belgium, Switzerland, and England, spending a total of about one year m these countries. This j^aper gives you some of our impressions. In Holland and Belgium the growers in the caves make low ridge bedc. They compost for a month, mainly outside. The bed temperature after 3 days is usually about 10° C. (50° F.) tlv same as the surrounding air temperature. They pick for about 6 months ; the yield is about 40 kg. per ton of manure. On this system with low bed and air temperatures there is no reason why ridge beds are used rather than flat beds (fig. 1). It is a very remarkable fact which can be read in all the French handbooks on mushroom cultivation, old and new, that the compost has a high temperature when the beds are made. But nowhere is it stated ex])licitly that this is a conditio sine qua non for successful cultivation in a cave Nor is it emphasized that the bed temperature must remain a little above the cave temperature for as long as possible.
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