Copeland . — The Mechanism of Stomata. 
363 
EXPLANATION OF THE FIGURES IN 
PLATE XIII. 
Illustrating Mr. Copeland’s paper on the Mechanism of Stomata. 
All the figures are of stomata. Unless the contrary is stated, cross sections 
are across the middle of the pore. 
Fig. 1. Medeola Virginica , L. Surface, x 380. 
Fig. 2. „ ,, Cross section, x 380. 
Fig. 3. Funaria hygrometrica , Sibth. Cross section, x 380. 
Fig. 4. „ ,, „ Surface. The inner dotted line bounds 
the respiratory chamber, x 380. 
*Fig. 5. Sagittaria variabilis, Engelm. Surface, x 510. 
Fig. 6. ,, „ „ Cross section, x 510. 
Fig. 7. Smilax glauca, Walt. Surface, x 510. 
Fig. 8. „ „ „ Cross section, x 1020. 
Fig. 9. Polygonum sagittatum , L. Cross section, x 1020. 
Fig. 10. Euonymus atropurfureus, Jacq. Stem. Cross section, x 510. 
Fig. 11. Aplectrum hyemale^uti. Cross section, x 510. 
Fig. 12. Quercus rubra , L. Cross section, x 1020. 
Fig. 13. ,, „ Cross section near end of stoma, x 1020. 
Fig. 14. Viburnum prunifolium , L. Cross section, x 1020. 
Fig. 15. Achillea millefolium , L. Surface, x 700. 
Fig. 16. ,, „ Cross section, x 700. 
Fig. 17. ,, ,, Cross section near end. x 700. 
Fig. 18. Polygonatum biflorum, Ell. Cross section, x 760. O. W. = outer wall 
Fig. 19. „ „ Surface, x 760. 
Fig. 20. Zea Mais. Cross section at 13 — /3 of Fig. 21. x 760. 
Fig. 21. „ „ Longitudinal section of a guard-cell. x 760. 
Fig. 22. „ ,, Cross section at a — a of Fig. 21. x 760. 
Fig. 23. „ ,, Surface, x 760. 
Fig. 24. Tsuga Canadensis , Carr. Cross section, x 5x0. 
Fig. 25. „ „ ,, Cross section of end. x 510. 
Fig. 26. „ ,, „ Longitudinal section, x 510. 
Fig. 37. „ ,, ,, Surface, x 510. The main focus is above 
the stoma. 
Fig. 38. Allium vineale,~L. Surface, x 510. The main focus is above the stoma. 
Fig. 29. „ „ Cross section, x 510. 
Fig. 30. „ „ Longitudinal section, x 510. 
Fig. 31. Osmunda Claytoniana , L. Cross section, x 700. 
Fig. 32. „ ,, Section across end. x 700. 
Fig. 33. „ „ Longitudinal section, x 700. 
Fig. 34. Anthoceros punctatus , L. Surface, x 380. 
Fig. 35. ,, „ Cross section, x 760. 
Fig. 36. Ophioglos sum pendulum. Cross section, x 380. 
Fig. 37. ,, )7 Section across end. x 380. 
B b 2 
