VI 
Index. 
PAGE 
SiNNOTT, Edmund W. — The ‘ Age and Area ’ Hypothesis and the Problem of Endemism . 209 
Small, James. — I rritability of the Pollen-presentation Mechanism in the Compositae . .261 
Geotropism and the Weber-Fechner Law ....... 313 
Stiles, Walter, and J0 Rgensen, Ingvar. — S tudies in Permeability. IV. The Action of 
Various Organic Substances on the Permeability of the Plant Cell, and its Bearing on 
Czapek’s Theory of the Plasma Membrane. With fifteen Figures in the Text . . 347 
= Studies in Permeability. V. The Swelling of 
Plant Tissue in Water and its Relation to Temperature and various Dissolved Sub- 
stances. With ten Tables and nine Figures in the Text ...... 415 
Stopes, Marie C. — Roots in Bennettites. With Plate XIV . '. . . . .257 
Thomas, Nesta, and Ferguson, Allan. — O n the Reduction of Transpiration Observations. 
With one Figure in the Text 241 
West, Cyril. — O n Stigeosporium Marattiacearum and the Mycorrhiza of the Marattiaceae. 
With Plate III and nine Figures in the Text 77 
i A Contribution to the Study of the Marattiaceae. With Plates XXI and XXII 
and thirty-three Figures in the Text ..... .... 361 
see Kidd, F. 
Willis, J. C. — The Relative Age of Endemic Species and other Controversial Points . . 1S9 
- — — — The Distribution of the Plants of the Outlying Islands of New Zealand. With 
one Diagram in the Text 327 
Further Evidence for Age and Area ; its Applicability to the Ferns, &c. . 335 
Yasui, Kono. — A Fossil Wood of Sequoia from the Tertiary of Japan. With Plate IV . 101 
B. LIST OF ILLUSTRATIONS. 
a. Plates. 
I, II. 
III. 
IV. 
V, VI. 
VII-XII. 
XIII. 
XIV. 
XV, XVI. 
XVII-XX. 
XXI, XXII. 
XXIII. 
H. H. W. Pearson in the Kirstenbosch Garden : Aloes in the fore- 
ground. Temporary Office and Plant Nurseries, Kirstenbosch. 
facing p. xiii 
Acrostichoid Ferns (Bower). 
Mycorrhiza of Marattiaceae (West). 
A Tertiary Sequoia (Yasui). 
Chlorochytrium (Bristol). 
New Zealand Orchids (Curtis). 
Ranalean Vascular Anatomy (Blackburn). 
Rootlets in Bennettites (Stopes). 
Polytrichum (Allen). 
Dadoxylon (Holden). 
Marattiaceous Anatomy (West). 
Influence of C 0 2 on Plant Embryos (Kidd and West). 
b. Figures. 
1. Series of transverse sections of the rhizome of Lepfochilus tricuspis, 
including a Jeaf-insertion (Bower) ...... 
2. Leptochilus tricuspis series illustrating the vascular system of sporo- 
phyll (Bower) 
3. Portion of the soral region of the sporophyll of Leptochilus tricuspis 
(Bower) 
4. Margin of scale of (a) Leptochilus tricuspis, (b) Neocheiropteris, ( c ) 
Platycerium sp., ( d) Goniophlebium sp. (Bower) .... 
5. Hairs associated with the sporangia of Leptochilus tricuspis (Bower) 
6. Part of transverse section of a fertile leaf of Leptochilus tricuspis, 
showing the diplodesmic structure and hairs associated with the 
sporangia (Bower) 
5 
6 
8 
9 
12 
> 
12 
