PLATE XLIII. PAPER BIRCH. 



1. Flowering branch with immature leaves, (s) staminate flowers, (p) pistillate flowers, x J. 



2. Branch with mature leaves, fruiting strobiles, and partly developed staminate aments, x i. 



3. A winged seed, enlarged. 



4. A strobile scale, enlarged. 



6. A winter branch with 3 partly developed terminal staminate aments, x \. 



6. Section of a lateral winter spur-branch, enlarged. 



7. Section of a terminal winter branch, enlarged. 



