692 



Forestry Quarterly 





Fig. 8. — Annual Ring Designation. 



Douglas fir. Ship. 2, tree 1, disc D. Curve showing average fiber Ieng[th by rings, at 



18 feet from ground. 



Periphery. 



Fig. 9. — ^Annual Ring Designation. 



Pith. 



Douglas fir. Ship. 2, tree 5. Curve showing average fiber length by rings, at 1J> feet 



from ground. 



