95. BETULA NIGRA, L 



River Birch, Red Birch. 



TRANSVERSE SECTION. 



RADIAL SECTION. 



TANGENTIAL SECTION. 



Schwarz-Birke. &*. Boolean noire. Sp. Abedul negro. 



Plotted and Swtlon. made by Romm B. Hnirt, B. A., Uwrito, H. Y.. U. S. A. 



