X 
Index . 
Figures. 
page 
8. Seedling plants of S. binervosa (de Fraine) ..... 258 
9. Transverse section of a root of S. binervosa (de Fraine) . . . 259 
10. Transverse section of part of the xyletn of the root of S. binervosa. 
Main bank plant (de Fraine) ....... 259 
11. Diagram of part of a root of a Main bank plant of S. binervosa (de 
Fraine) 260 
12. A = diagram of the transverse section of the root of a Main bank plant 
of S. binervosa; B = diagram of the transverse section of a root of 
a plant of S. binervosa cultivated in garden soil from seed (de 
Fraine) 261 
13. Diagram of the longitudinal section through the apex of rosettes of 
S. binervosa (de Fraine) . . ..... 264 
14. Diagram of part of stem of S. binervosa (de Fraine) . . . 265 
15. Diagram of part of the leaf-blade of S. binervosa and S. bellidifolia in 
its middle region (de Fraine) ....... 267 
16. Diagram of the transverse section of the middle region of the petiole of 
S. binervosa and S. bellidifolia (de Fraine) ..... 268 
17. Sclereides from the petiole of S. binervosa (de Fraine) . . . 369 
18. Sclereides from the leaf-sheath of S. binervosa, narrow-leaved plant 
(de Fraine) 269 
19. Transverse sections of part of the leaf-blade of S. binervosa and of 
S. bellidifolia (de Fraine) 270 
20. Transverse section of the leaf-margin of S. binervosa and S. bellidifolia 
(de Fraine) 271 
21. Upper epidermal cells of S. binervosa and of S. bellidifolia (de Fraine) 272 
22. Diagram of part of the inflorescence axis of S. binervosa (de Fraine) 274 
23. Part of the inflorescence axis of S. bellidifolia, narrow-leaved binervosa, 
and broad-leaved binervosa (de Fraine) ..... 275 
24. A, Gland in surface view from the inflorescence axis of S. bellidifolia ; B, 
Part of the epidermis ; C, Stoma of S. binervosa (de Fraine) . 275 
25. Transverse section of part of the inflorescence axis of broad-leaved 
S. binervosa and of S. bellidifolia (de Fraine) . . . .276 
26. Diagram of a transverse section of a root of S. bellidifolia (de Fraine) . 277 
27. Detail of part of xylem in root of S. bellidifolia (de Fraine) . . 278 
28. Transverse section of the stem of S. bellidifolia (de Fraine) . . 278 
1. Apparatus for measuring rate of tissue-shrinkage (Delf) . . . 285 
2. Diagrammatic representation of cross-section of middle region of leaf of 
onion (Delf) .......... 289 
3. Transverse section of middle region of onion leaf (Delf) . . . 289 
4. Longitudinal section of middle region of onion leaf, taken between the 
bundles (Delf) .......... 290 
5. A single cell from a longitudinal section of a turgid onion leaf, show- 
ing stages in plasmolysis (Delf) . . . . . . .291 
6. Diagrammatic representation of transverse section of middle region of 
dandelion scape at flowering period (Delf) ..... 292 
7. Part of transverse section of middle region of dandelion scape taken be- 
tween the larger bundles (Delf) . . ..... 292 
8. Curves comparing effect of 0*18 and 0*73! grm. M. concentration of 
sugar on the plasmolytic contraction of onion leaves (Delf) . . 294 
9. Curves showing effect of temperature on onion in distilled water at 36° C. 
and plasmolytic contraction at same temperature (Delf) . . 296 
10. Curves showing effect of temperature on onion in distilled water and 
effect of subtonic sugar solution (0*18 grm. M.) (Delf) . . . 297 
1 1 . Chart of the course of the shrinkage- time curves of onion leaf at different 
temperatures (Delf) 298 
12. Curve showing the rates of shrinkage of tissue of onion leaf under uni- 
form external osmotic compression but at different temperatures 
(Delf) 299 
13. Curves showing percentage contraction of dandelions at I9°C. with 
subtonic solution (0-3 grm. M. sugar) (Delf) .... 301 
14. Chart of shrinkage-time curves of dandelion scape at different tempera- 
tures (Delf) 302 
J 5. Curve of relation to temperature of the rate of shrinkage of tissue of 
dandelion scape (Delf) ......... 304 
16. Relation of temperature and permeability of protoplasm (Delf) . 306 
17. Course of plasmolysis of elder pith in 0'73i grm. M. saccharose solu- 
tion at different temperatures (Delf) ...... 307 
