Jul. 139, U. S. Deot. of Agriculture. 
Plate II, 
Radial Section of the Wood of Norway Pine Magnified 50 Diameters; 
e. w., Early Wood; 1. iv.. Late Wood; t.. Tracheids; p. r., Pith Ray; r. c. 
Resin Canal in Pith Ray: Also a Longitudinal Canal. 
