U. S. DEPARTMENT OF AGRICULTURE. 



BUREAU OF PLANT INDUSTRY— BULLETIN NO. 85. 



B. T. GALLOWAY, Chief of Bureau. 



THE PRI^TTPLES OF MUSHROOM GROWING 

 AND MUSHROOM SPAWN MAKING. 



BY 



B. M. DUGGAR, 

 Professor of Botany in the University of Missouri, and 

 Collaborator of the Bureau of Plant Industry. 



VEGKTABLE PATHOLOGICAL AND PHYSIOLOGICAL 

 INVESTIGATIONS. 



Issued November 15, 1905. 



LIBRARY 

 NEW YORK 



BOTANICAL 

 GAf?DE^, 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 

 1905. 



