No] 
CONTENTS. 
PAGE 
H. H. W. Pearson, F.R.S., Sc.D. (Cambridge). With Plate * 
No. CXXI, January, 1917. 
Bower, F. O. — Studies in the Phylogeny of the Filicales. VI. Ferns showing the e Acrosti- 
choid 1 Condition, with special reference to Dipterid Derivatives. With Plates I 
and II and fifteen Figures in the Text 
Arber, Agnes. — On the Occurrence of Intrafascicular Cambium in Monocotyledons. With 
three Figures in the Text 
Stiles, Walter, and Jorgensen, Ingvar. — Studies in Permeability. IV. The Action of 
Various Organic Substances on the Permeability of the Plant Cell, and its Bearing on 
Czapelc’s Theory of the Plasma Membrane. With fifteen Figures in the Text . 
West, Cyril. — On Stigeosporium Marattiacearum and the Mycorrhiza of the Marattiaceae. 
With Plate III and nine Figures in the Text 
Yasui, Kono. — A Fossil Wood of Sequoia from the Tertiary of Japan. With Plate IV 
Bristol, B. Muriel. — On the Life-history and Cytology of Chlorochytrium grande, sp. nov. 
With Plates V and VI and two Figures in the Text 
Brierley, William B. — Spore Germination in Onygena equina, Willd. . 
Curtis, K. M. — The Anatomy of the Six Epiphytic Species of the New Zealand Orchidaceae. 
With Plates VII-XII 
Blackburn, Kathleen B.— On the Vascular Anatomy of the Young Epicotyl in some 
Ranalean Forms. With Plate XIII and nineteen Figures in the Text 
1 
4 1 
47 
77 
101 
107 
127 
133 
151 
No. CXXII, April, 1917. 
Pickering, Spencer. — T he Effect of one Plant on Another. With three Figures in the Text 18 1 
Willis, J. C. — The Relative Age of Endemic Species and other Controversial Points . .189 
Sinnott, Edmund W. — The ‘ Age and Area ’ Hypothesis and the Problem of Endemism . 209 
Blackman, V. H., and Knight, R. C. — A Method of Controlling the Rate of Air Movement 
in Transpiration Experiments. With one Figure in the Text . . . • .217 
Knight, R. C. — The Interrelations of Stomatal Aperture, Leaf Water-content, and Transpira- 
tion Rate. With four Figures in the Text . .221 
/ Thomas, Nesta, and Ferguson, Allan.— O n the Reduction of Transpiration Observations. 
With one Figure in the Text 241 
Stopes, Marie C. — Roots in Bennettites. With Plate XIV 257 
Small, James. — I rritability of the Pollen-presentation Mechanism in the Compositae . . 261 
Allen, Charles E. — The Spermatogenesis of Poly trichum juniperinum. With Plates XV 
and XVI 269 
Mangham, Sydney. — O n the Mechanism of Translocation in Plant Tissues. An Hypothesis, 
with special reference to Sugar Conduction in Sieve-tubes. With two Figures in the 
Text 293 
NOTE. 
Small, James. — G eotropism and the Weber-Fechner Law . . . . . . .313 
Nos. CXXIII and CXXIV, July and October, 1917 (Double Number). 
Holden, the late Ruth. — O n the Anatomy of Two Palaeozoic Stems from India, With 
Plates XVII-XX 315 
Willis, J. C. — The Distribution of the Plants of the Outlying Islands of New Zealand. With 
one Diagram in the Text . 327 
A 2 
