236. BETULA OCGIDENTAL1S Hook. 



Western Birch, Puget 'Sound Birch. 



TRANSVERSE SECTISN 



ftASIAL SKCT1SN, 



TANGENTIAL SECTION. 



Westliche Birke. 



Bouleau occidental 



Abedul occidental. 



and svcttofw mad* by Rom*yn B. Hough, B. A., LewviH*. N. Y., U. S. A, 



