MUSHROOM GROWING 



permissible, but it seems fairly certain that 

 no transfer of spawn should be made from 

 a bed which has begun to bear mushrooms 

 vigorously. By transfer in this case I mean 

 either direct transfer of the growing spawn 

 into fresh beds, or transfer to other beds, 

 after drying and preserving the spawn until 

 the next season. 



Any method of spawn-making which in- 

 volves the use of an unknown strain or va- 

 riety of mushrooms is essentially haphaz- 

 ard, and by such chance procedure there 

 can be no progress in the selection and 

 maintenance of desirable strains or varieties, 

 and no accumulation of benefits. More- 

 over, it is not possible even to know the 

 worth of the strain unless the finder were 

 able to await the result of a preliminary 

 test. On this ground, therefore, the writer 

 determined that for the general success of 

 mushroom growing in America it would 

 be desirable, first of all, to attempt to de- 

 velop a method by which one might select 



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