Bui. 426, U. S. Dept. of Agriculture. 



Plate V. 



Transverse Section of the Wood of Sugar Pine Magnified 50 Diameters. 



<:. w., Kiirly wfxj'l; i. id., laU; wooil; L, traclieids; p. v., pilli riiyw; r. c, renin canal. 



