Douglas Fir Fiber 



693 



Periphery 



Pith. 



Douglas fir. Ship. 3, tree 8. Curves showing average fiber length by 

 rings, at 19 feet from ground. 



-+> 

 60 

 C 



O 



f^ 2 



1 



Periphery. 



Fig. U. — Annual Ring Designation. 



s 



Pith. 



Douglas fir. Ship. 3, tree 10. Curve showing average fiber length by rings, at 19 feet 



from ground. 



