Index 
vii 
PAGE 
Figures. 5, 6. Xylem strands and cross-sections of aerial stem (Sykes) .... 71 
7. Apex of adult specimen (Sykes) 72 
8, 9. Cross-sections through a fertile stem, &c. (Sykes) 74 
10. Apical region of adult plant (Sykes) ....... 76 
11, 12. Abnormal branch, bearing extra leaf (Sykes) 76 
13. Morphological relationships (Sykes) 84 
1. Anthocerotaceae : Median longitudinal sections of embryos (Campbell) . 98 
2. Median sections of older sporophytes (Campbell) ..... 99 
1-6. Delphinium requienii (Sargant) ........ 163 
7, 8. Nigella damascena (Sargant) 163 
9. Althea rosea (Sargant) . . . 163 
10-12. Tetrarch type (Sargant) 164 
13-15. Althea rosea (Sargant) 170 
16-18. Anemarrhena asphodeloides (Sargant) 170 
19-21. Podophyllum peltatum (Sargant) . . 170 
1- 4. Hesperantha matopensis (Gibbs) 198 
5- 7. Hesperantha matopensis (Gibbs) 199 
8, 9. Justicia elegantula (Gibbs) 202 
10. Justicia elegantula (Gibbs) ......... 203 
1. Young sieve-tube (Hill) ......... 261 
2. Section of sieve-tube (Hill) 262 
3. Diagrammatic view of sieve-plate (Hill) 262 
4. Phloem in transverse section (Hill) ....... 263 
5. Sieve-tube and companion cell (Hill) 264 
6- 8. Development of slime-strings from groups of threads (Hill) . . .271 
9. Old sieve-plate of empty sieve-tube (Hill) 272 
10-12. Development of slime-strings from single threads (Hill) . . . 274 
13. Tangential section of phloem (Hill) ....... 277 
1. Petiolar bundle of Microlepia platyphylla (McNicol) .... 402 
1 a. Petiolar bundle of Nephrolepis (McNicol) .... . 404 
2- 5. Formation of cavity parenchyma in Nephrolepis (McNicol) . . . 404 
6. Transverse section of petiole of Alsophila excelsa (McNicol) . . . 406 
7. Transverse section of single ‘ bay ’ in vascular bundle of A. excelsa 
(McNicol) 406 
1. The Sexuality of the Ascomycetes (Fraser and Welsford) . . . 471 
1 . Three alternative theories of past history of Gnetales (Arber and Parkin) 491 
2. Diagrammatic relative plans of Gnetalean strobili (Arber and Parkin) 499 
3. The microsporangia of Gnetales (Arber and Parkin) .... 503 
1. Elevation of control and heating baths (Balls) ..... 561 
2. Apparatus (Balls) 562 
3. Elevation of microscope and chamber (Balls) ..... 563 
4. General plan of apparatus (Balls) . 564 
1. Sympodial structure (Worsdell) ........ 653 
2. Petiolar vascular structure in Dicotyledons (Worsdell) . . . 676 
3. Petiolar vascular structure of Paeonia and Magnolia (Worsdell) . . 677 
4. Petiolar vascular structure of Calycanthaceae (Worsdell) . . . 678 
1-5. Bensonites fusiformis (Scott) . . . . . . . . .684 
6, 7. Bensonites fusiformis (Scott) *685 
1. Normal seedling of Arisarum (Hill) . . . . . . . 713 
2. Abnormal seedling (Hill) . . . . . . . . . 713 
1. Types of hair in the Wallflower (Boodle) . . . . . . 715 
c. Diagrams 1-8. Seedling Structure of Gymnosperms (Hill and de Fraine) . . 691-707 
Curves 1-7. Temperature and Growth (Balls) ....... 571-588 
