Sul. 139, U. S. Dept. of Agriculture 



Plate 11. 



Radial Section of the Wood of Norway Pine Magnified 50 Diameters; 

 e. w., Early Wood; 1. u>., Late Wood; t., Tracheids; p. r., Pith Ray; r. c, 

 Resin Canal in Pith Ray; Also a Longitudinal Canal. 



