BULLETIN" 286, U. S. DEPAETMENT OF AGRICULTURE. 
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Fig. 4. — Effect of preservative treatment on the strength and stiffness of longleaf-pine stringers treated 
partially dry. 
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Fig. .5. 
BEAM NUMBER 
9 % NATURAL Q—O TREATED (bOILING PROCESS^ 
B - Burte T- Tops 
-Effect of "boiling process" of preservative treatment on the strength and stiffness of Douglas-fir 
stringers treated green and tested without seasoning. 
