LETTER OF TRANSMITTAL. 
U. S. DerartMent or AGRICULTURE, 
Bureau or Puant Iypusrry, 
Orrice oF THE CHIEF, 
Washington, D. C., August 14, 1911. 
Srr: I have the honor to transmit herewith and to recommend for 
publication as a Farmers’ Bulletin a manuscript entitled “The Con- 
trol of the Chestnut Bark Disease,” by Dr. Haven Metcalf, Patholo- . 
gist in Charge, and Prof. J. Franklin Collins, Forest Pathologist, 
of the Office of Investigations in Forest Pathology. The writers 
describe their method of restricting the spread of this dangerous 
disease by destroying advance infections, a method which is already 
being applied on a large scale by the State of Pennsylvania. It is 
hoped to perfect plans whereby through general cooperation the 
disease may be kept within the territory snere infection is already 
general and the largest and best chestnut forests of the country, 
especially those of the south Appalachians, be kept permanently free 
from the disease. 
The experimental data upon which the recommendations con- 
tained in this publication are based will be published in full in a 
forthcoming bulletin of the Bureau of Plant Industry. 
Respectfully, 
B. T. Skew, 
Chief of Bureau. 
Hon. James Wi1son, ; 
Secretary of Agriculture. 
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