The principles of mushroom growing and mushroom spawn making . s insure its useonly by those who are able to give it their best attention and who willdoubtless develop it to the fullest commercial extent. It has not beensui^posed by the writer that the work thus far accomplished will en-able all mushroom growers to manufacture their own spawn withcomparative ease. In other phases of horticultural work it is not somuch to individual growers as to progressive seedsmen that we lookfor the best seed of improved varieties. The same thing apparentlymust be anticipated in the development of the mushr
The principles of mushroom growing and mushroom spawn making . s insure its useonly by those who are able to give it their best attention and who willdoubtless develop it to the fullest commercial extent. It has not beensui^posed by the writer that the work thus far accomplished will en-able all mushroom growers to manufacture their own spawn withcomparative ease. In other phases of horticultural work it is not somuch to individual growers as to progressive seedsmen that we lookfor the best seed of improved varieties. The same thing apparentlymust be anticipated in the development of the mushroom growing of selected spaAvn may. in general, become a specializedprocess. Xevertheless, it is believed that in time a method of spawn pro-duction from spores without pure-culture precautions will be devel-oped. The necessity of developing immediately, or placing on apractical basis, the pure-culture process has temporarily directed theexperimental work along other lines. Bui. 85, Bureau of Plant Industry, U. S. Dept. of Agriculture. Plate Fig. 1.—a Fine Cluster of Agaricus Campestris, the Horticultural Variety
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