on the green parts of Hibiscus vitifolius Linn. 209 



Fig. 4. Vertical section of leaf shewing various forms of out- 

 growths. M. mucilage cell. 



Fig. 5. Outgrowth from a leaf seen as a solid object. 



Fig. 6. Transverse section of a leaf shewing a small outgrowth 

 on the upper side. M. mucilage cell. 



Fig. 7. Larger outgrowth, containing mesophyll, on the upper side 

 of a leaf. M, mucilage cell. 



Fig. 8. Transverse section of a small outgrowth near its apex. 



Fig. 9. Transverse section of a small outgrowth, nearer the leaf 

 than the preceding. 



Fig. 10. Transverse section of a larger outgrowth, containing 

 chlorophyll. 



Fig. 11. A section similar to fig. 10, but nearer the leaf. 



Fig. 12. A horizontal section of a portion of the leaf in the region 

 of the base of an outgrowth. The chlorophyll-containing cells belong 

 to the mesophyll ; the others to the epidermis. 



Fig. 13. Longitudinal section (partly optical) of an outgrowth on 

 the stem. The outgrowth bears two simple hairs. At the base, below 

 the epidermis of the stem, is collenchyma. 



Fig. 14. Young outgrowth on the stem (more highly magnified.) 



Fig. 15. Older outgrowth on the stem. 



Fig. 16. Old outgrowth on the stem, shewing the formation of the 

 cork layer. 



Fig. 17. Optical longitudinal section of a glandular hair. 



Fig. 18. Transverse section of a glandular hair below the head. 



Fig. 19. Transverse section nearer the leaf than the previous 

 section. 



Fig. 20. A similar section still nearer the leaf. 



Fig. 21. Young seedling with small outgrowths on the leaves and 

 cotyledons. 



Fig. 22. Leaf, from an old plant, densely covered with out- 

 growths. 



N\B. Figures 1, 2, 3, 15, 16, 17, 22 are on Plate VIII; Figures 4, 

 6, 7, 14 are on Plate IX; Figures 5, 8, 9, 10, 11, 12, 13, 18, 19, 20, 

 21 are on Plate X. 



