iv Page 
Notes on Freshwater Algae, I—IV (2 Text-figs.)— 
W. J. Hodgetts . 254 
OBITUARY. JamesWilliamHelenusTrail. M. S(kene) 46 
Occurrence of Actinomyces-like Endotrophic Mycorhiza, 
The (5 Text-figs.)—Jean Dufrenoy ... ... 40 
Origin of Leaves, A Theory of the (3 Text-figs.)—J. Small 211 
Oxygen, see Absorption. 
Plant Families: A Plea for an International Sequence— 
Alfred Gundersen ... ... ... ... ... 264 
Plant Growth, see Efficiency Index of. 
Plant Growth, see Quantitative Analysis. 
Plants, The Evolution of, [Review]—A. G. T(ansley) ... 1 
Phylogenetic Considerations on the Internodal Vascular 
Strands of Equisetum (7 Text-figs.)—I. M. P. Browne 11 
Physiological Anatomy of Xerophytic Selaginellas 
(12 Text-figs.)—J. C. Th. Uphof ... ... ... 101 
Preliminary Note on a Hydrion Differentiation Theory of 
Heliotropism—J. Small ... ... ... ... 275 
Preliminary Notes on Additional Evidence for the Hydrion 
Differentiation Theory of Geotropism—J. Small, 
J. Small & M. W. Rea, J. Small & M. J. Lynn 208, 209, 211 
Primitive Plants from the Geologist’s Viewpoint, The 
Evolution of—Chas. Schuchert ... ... ... 272 
Quantitative Analysis of Plant Growth, Methods and 
Significant Relations in the—C. West, G. E. Briggs, 
and F. Kidd .. 200 
Respiration, see Absorption. 
Reversal of Geotropic Curvature in the Stem, On the—- 
J. Small and M. W. Rea ... ... ... ... 208 
REVIEWS:— 
I.—The Evolution of Plants—A. G. T(ansley) 1 
II.—Elementary Lecturing with the Help of 
Schedules—A. G. T(ansley) ... ... 44 
III.— Fossil Plants by A. C. Seward—W.N.E. 277 
Root Pressure, The Mechanism of (2 Text-figs.)— 
J. H. Priestley . ••• . 189 
Roots, see Angle of Balance in. 
Rosa , Hybridism and Classification in the Genus— 
J. R. Matthews ... ... ... ... ... 153 
