17. BETULA LUTEA, MICHX. F. 



Yellow Birch, Gray Birch, 



TRANSVERSE SECTION, 



RADIAL SECTION. 



TANGENTIAL, SECTION. 



Gelbe Birke. Sfo Bouleau jaune. >j>< Abedul amarillo, 



PUBUSHBD AMD SECTIONS XAD8 BT ROMKTK B. HO0QH, B. A., LoWrtXJUB, N. Y., U. 3. A. 



