

LETTER OF TRANSMITTAL. 



The botanical illustrations showing external characters are by Mr. George B. Sudworth ; those 

 of the anatomy of the wood are by Mr. N. B. Pierce and Mr. Filibert Roth, and those of parasitic 

 organisms and disease conditions are from Hartig's "Lehrbuch der Baumkrankheiten" and 

 "Zersetzungserscheinungeu des Holzes." The illustrations accompanying the section on injurious 

 insects were furnished by the Division of Entomology. The map of distribution was prepared in 

 the Division of Forestry. 



The monograph is believed to be just in time for the use for which it is intended, namely, to 

 prepare for the application of sylviculture to the remnant of oar pineries. 



Respectfully, 



B. E. FERNOW, 



Chief of Division. 

 Hon. JAMES WILSON, 



Secretary of Agriculture, 



