Yellow Birch. Gray Birch 
1. Winter twig, x I. 
2. Portion of twig, enlarged. 
3. Leaf, x %. 
4. Flowering branchlet, x %. 
5. Staminate flower, enlarged. 
6. Pistillate flower, enlarged. 
7. Fruiting branchlet, x %4. 
8. Fruit, x ro. 
— 8g — 
