Bui. 606, U. S. Dept. of Agriculture. 



Plate II. 



Red Oak (Cross Section, Magnified 50 Diameters). A Ring-Porous Wood. 



AR, annual ring; SP, springwood; Sir, summerwood; ME, medullary ray; I", pores or vessels; 

 J\T, wood prosenchyma (fibers, etc.). 



