322 Bulletin 240, 



ducing these food substances which are later absorbed by the " sapro- 

 phyte " as in typical cases of metabiosis. 



I wish in closing to acknowledge my indebtedness to Dr. L. B. Men- 

 del of Yale University for the analysis of the fermented mushroom 

 extracts, and for suggestions on certain of the chemical problems, and to 

 C. W. Edgerton, Assistant in Botany in Cornell University, who under my 

 direction has prepared all the media, the distilled water, and has assisted 

 in other ways. 



