LETTER OF TRANSMITTAL 



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U. S. Department of Agriculture, 



Bureau of Plant Indl stry. 



Office of the Chief, 

 Washington^ D. C.^ August '21^ 1905. 

 Sir : I have the honor to transmit herewith a paper entitled " The 

 Principles of Mushroom Growing and Mushroom Spawn Making," 

 and to recommend that it be published as Bulletin No. 85 of the series 

 of this Bureau. 



This paper was prepared by Dr. B. M. Duggar, Professor of 

 Botany in the University of Missouri and Collaborator with the 

 ^ Office of Vegetable Pathological and Physiological Investigations of 

 ~ this Bureau. Under the direction of the Pathologist and Physiolo- 

 gist, Doctor Duggar has been engaged for several years in the inves- 

 tigation of nnishroom culture in all of its phases, and great advances 

 have been made, especially in the production of purer and better 

 spawns. 



The accompanying illustrations are necessary to a complete under- 

 standing of the text of this bulletin. 



Respectfully, B. T. Galloway, 



Chief of Bureau. 

 Hon. James Wilson, 



Secretary of Agnculture. 



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