17. BETULA LUTEA, MICHX. F. 



Yellow Birch, Gray Bircla, 



TRAN8VER8E SECTION. 



RADIAL SECTION. 



TANGENTIAL SECTION, 



Gelbe Birke, Bouleaujanne. )< Abedul ainarillo, 



PUBXIBHEB AJRD SBOTION8 MADK BT BOMKTK B. HoOOH, B. A., LOWVUJLB, N. Y., U 



