LETTER OF TRANSMITTAL. 
U.S. DEPARTMENT OF AGRICULTURE, 
BurREAU OF PLANT INDUSTRY, 
OFFICE OF THE CHIEF, 
Washington, D. C., December 24, 1902. 
Str: 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. 
Respecttully, 
B. T. GaLLoway, 
Chief of Bureau. 
Hon. JAMES Wuinson, 
Secretary of Agriculture. 
