Bui. 884, U. S. Dept. of Agriculture. 
Plate I. 
u 
# 
Photomicrograph of a Transverse Section of Sycamore Wood. 
r., annual ring or yearly growth layer; V 1 , vessels or pores of early or spring wood: F 2 , vessels 
of late or summer wood; m. r., medullary or pith rays which extend in the radial direction and 
give the figure in the quartered wood. 
