VI 
Contents . 
PAGE 
Bottomley, W. B. — The Effect of Organic Matter on the Growth of various Water Plants in 
Culture Solution. With Plate XVII 353 
McLean, F. T. — Field Studies of the Carbon Dioxide Absorption of Coco-nut Leaves. With 
Plate XVIII and nine Diagrams in the Text 367 
Dastur, Jehangir Fardunji. — T he Mode of Infection by Smut in Sugar-cane. With ten 
Figures in the Text ............. 391 
Dastur, Jehangir Fardunji. — C hoanephora cucurbitarum, (B. and Rav.) Thaxter, on 
Chillies (Capsicum spp.). With Plate XIX 399 
Lewis, Francis J., and Tuttle, Gwynethe M. — Osmotic Properties of some Plant Cells 
at Low Temperatures. With five Graphs and five Figures in the Text . . . 405 
No. CXXXVI, October, 1920. 
Hill, Arthur W. — Studies in Seed Germination. Experiments with Cyclamen. With Plate 
XX and fifteen Figures fn the Text . . . 417 
Boodle, L. A. — The Mode of Origin and the Vascular Supply of the Adventitious Leaves of 
Cyclamen. With six Figures in the Text . . . . . . . . 431 
Kidd, Franklin, and West, Cyril. — T he Role of the Seed-coat in Relation to the Germina- 
tion of Immature Seed. With six Tables and one Chart in the Text . . . 439 
Arber, Agnes. — O n the Leaf Structure of certain Liliaceae, considered in Relation to the 
Phyllode Theory. With thirty-eight Figures in the Text ...... 447 
Ferdinandsen, C., and Winge, O. — Clathrosorus, a New Genus of Plasmodiophoraceae. 
With Plate XXI 467 
Willis, J. C. — Plant Invasions of New Zealand with Reference ta Lord Howe, Norfolk, and 
the Kermadec Islands. With three Diagrams and eleven Tables in the Text . . 471 
Uphof, J. C. Th. — C ontributions towards a Knowledge of the Anatomy of the Genus 
Selaginella. The Root. With thirteen Figures in the Text ..... 493 
Hodgetts, William J. — A New Species of Spirogyra. With Plate XXII and five Figures 
in the Text ........... ... 519 
Rivett, Maud F. — The Anatomy of Rhododendron ponticum, L., and of Ilex Aquifolium, L., 
in Reference to Specific Conductivity. With seventeen Diagrams in the Text . . 525 
Drummond, Montagu — B esleria lutea, Linn., a New Example of Water-calyx . . . 551 
NOTE. 
Jones, W. Neilson. — A Simple Root Auxanometer. With two Figures in the Text . . 555 
