ii LIST OF PLATES. 



PLATE VIII. 



Figs. 25. A minute portion of a Hop leaf. — 26. The seed of the Hop. — 27, 2o. 

 Portions of the acorn-cup of the Valonia Oak. — 29, 30. Branched 

 and simple hairs. 



PLATE IX. 



Figs. 1. A leaf Virginian Tobacco attached to stem. — 2. Portion of skin from 

 under surface.— 3. Hairs separated. — 4. A transverse-vertical section 

 of portion of leaf-blade, with hairs and breathing pores on under 

 surfiiee. — 5. A horizontal section of midrib of leaf.- — 6. A leaf of 

 Burdock. — 7. Hairs from under surface of leaf terminating in long 

 delicate filaments. — 8. Horizontal section of midrib of leaf with lobed 

 outline, and bundles of woody fibre separated. — 9. Leaf of Dock, the 

 stipule at base of stalk detached. — 10. Club-shaped, striated hairs, 

 from skin of midrib and veins. — 11. Horizontal section of midrib, 

 with lobed surface, and woody bundles separated. — 12. A portion of 

 skin of under side of leaf blade. 



PLATE X. 



Figs. 1. A leaf of Chicory.— 2. A horizontal section from midrib of leaf, 

 with thin woody bundles. — 3. A portion of the skin removed from 

 under side of leaf. — 4. Leaf of Comfrey. — 5. Horizontal section of 

 midrib of leaf, showing the position and character of woody bundles. 

 — 6. A minute portion from the skin of the leaf on its irnder side. — 

 7. Leaf of Jerusalem Artichoke. — 8. Horizontal section of midrib of 

 leaf, with woody bundles. — 9, Epidermis from under side of leaf. 



