220 proceedings: society of American foresters 



mended in wooden ship specifications have made possible their construc- 

 tion in the East where the large timbers originall}'' called for are not 

 available. 



Mr. Rolf Thelen then explained the various types of airplanes and 

 their method of construction. He dwelt particularly^ on the kinds of 

 wood used and the ways in which wood enters into airplane construc- 

 tion, mentioning some of the difficulties encountered in securing suit- 

 able material and how these are being overcome. 



During the discussion which followed, Dr. L. F. Hawley, Chemist 

 for the Forest Products Laboratory, was called on and spoke of the im- 

 portance of products derived from wood in the war — acetone, acetate 

 of lime, alcohol, and charcoal being mentioned particularly. 



Following the program refreshments were served and the meeting 

 adjourned. 



J. A. Mitchell, Secretary. 



