A 
Bui. 606, U. S. Dept. of Agriculture. 
Plate I. 
ifeP^ 
wit 
fpF 
-3p§Eg*s5 
Maple (Cross Section, Magnified 50 Diameters). A Diffuse-Porous Wood. 
AR, annual ring; SP, springwood; SW summerwood; MR, medullary ray; P, pith fleck; V, 
pores or vessels; JC, wood prosenchyma (fibers, etc.). 
