LETTER OF TRANSMITTAL 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF PLANT INDUSTRY, 



OFFICE OF THE CHIEF, 

 Washington, D. C., December %h 1902. 



SIR: I have the honor to transmit herewith a technical paper on 

 The " Bluing" and the "Red Rot" of the Western Yellow Pine, with 

 Special Reference to the Black Hills Forest Reserve, and respectfully 

 recommend that it be published as Bulletin No. 36 of the series of this 

 Bureau. 



This paper was prepared by Dr. Hermann von Schrenk, Special 

 Agent of this Bureau in Charge of Timber Rot Investigations, a line 

 of work being conducted jointly by this Bureau and the Bureau of 

 Forestry, and it was submitted by the Pathologist and Physiologist 

 with a view to publication. 



The illustrations, which comprise 14 full-page plates, several of 

 which are colored, are considered necessary to a full understanding of 

 the text. 



Respectfully, 



B. T. GALLOWAY, 



Chief of Bureau. 

 Hon. JAMES WILSON, 



Secretary of Agriculture. 



