X 
Index. 
Figures. page 
67-74. 67-70 illustrate the transition phenomena in 1 Seedling C ’ and 71-74 in ‘ Seedling 
D ’ (Holden and Daniels) 476 
75-80. A goblet-shaped amphisyncotyl, showing an abnormal type of transition (Holden 
and Daniels) 477 
81-88. 81-83 illustrate the earlier stages of transition in an amphitrisyncotyl ; 84-88, the 
earlier stages of transition in a tricotyl (Holden and Daniels) . . . 478 
89-97. A ‘ Type 1 ’ seedling, showing an abnormal type of transition (Holden and 
Daniels) 480 
1. Distribution in Ceylon of the earlier VR, R, and RR species from Trimen’s * Flora 3 4 5 
(Willis) 494 
2. Diagram showing hypothetical distribution of a wide in New Zealand (Willis) . 497 
3. Map for Ranunculus (Willis) 498 
4. Number of wides and endemics at each successive zone of one hundred miles : 
northern invasion (Willis) .......... 499 
5. Ditto : southern invasion (Willis) ......... 500 
6. Percentages plotted as curves (Willis) . .510 
Map of the Bahama Islands (Taylor) . . 531 
1 . Barley , plants grown in pots. Dry weights of shoots, upper curves ; dry weights 
of roots, lower curves (Brenchley and. Jackson) ...... 540 
2. Barley , shoot /root ratio (Brenchley and Jackson) , 543 
3. Wheat , plants grown in pots. Dry weights of shoots, upper curves ; dry weights of 
roots, lower curves (Brenchley and Jackson) ...... 550 
4. Wheat, shoot/root ratio (Brenchley and Jackson) 552 
1-11. 1. Sporidium germinating on slide and producing a single germ tube with a muci- 
laginous sheath. 2. Germinating sporidium producing two germ tubes with 
mucilaginous sheaths. 3. Ditto producing three germ tubes. 4. Ditto producing 
a vesicle. 5. Ditto producing vesicle with a mucilaginous investment. 6. Spori- 
dium germinating and producing a vesicle which is developing a germ tube 
above. 7. Ditto germinating on barberry leaf and producing a vesicle. 8. Ditto 
on barberry leaf, germinating with production of a simple germ tube, the tip of 
which is adpressed to the surface of the leaf. 9. Ditto attached to leaf and pro- 
ducing a beak-like protuberance at one end. 10. Beak-like projection of spori- 
dium producing an indentation of the cuticle. 11. Outgrowth from sporidium 
pressing upon the cuticle and forcing up the end of the sporidium (Water- 
house) 560 
12-19. I2 * Sporidium producing a longer beak-like process with its densely protoplasmic 
tip closely pressed against the cuticle. 13. Ditto producing a style-like infection 
hypha which has pierced the cuticle. 14. Ditto showing the infection hypha 
which has penetrated the whole thickness of the epidermal wall. 15. Infection 
hypha, developed from a germ tube, which has pierced the cuticle. 16. Germina- 
tion of sporidium has led to the formation of irregular vesicles. An infection 
style has penetrated the epidermal cell and is beginning to swell at the tip. 
17. A later stage of penetration. The vesicle in the epidermal cell has increased 
in size. 18. Larger vesicle showing three nuclei. 19. Two epidermal cells which 
have been invaded, showing the branching of the mycelium arising from the in- 
fection vesicle. The shrivelled remains of the germinated sporidia are to be seen 
on the leaf surface (Waterhouse) . . . 561 
1. Transverse section of protostele in hypocotyl of young seedling (Hatfield) . 569 
2. Seedling of Macrozamia Fraseri (Hatfield) 569 
3. A. Transverse section of seedling above stem apex, showing cotyledon tube and 
traces, and first three plumular leaves, in two of which leaf-traces are developed. 
B. Ditto of same seedling at point where fusion of cotyledon tube and of foliage 
leaves with axis is nearly complete, c. Ditto of same seedling just above the 
cotyledonary node (Hatfield) . . . . . . . . . 570 
4. Transverse section of cotyledonary node (Hatfield) . . . . . . 571 
5. A. Transverse section of plant just above stem apex, showing bases of five youngest 
