iv 
Index of Subjects 
PAGE 
Geotropic Response, The Supposed Reversal of—F.C.Newcombe 281 
Hybridism in the New Zealand Flora—L. Cockayne . . 105 
Imperial Botanical Conference, 1924 . . .149 
Laboratory Note, see Stem Elongation 
Leaf Cells of Picea canadensis (Mill.) B.S.P., On the Phenomena 
attending Seasonal Changes in the Organisation in, see Seasonal 
Changes 
Leaf-enation in Allium ursinum L., An Example of (10 Text-figs.) 
—S. L. Ghose . . . . . . -49 
Liverpool, Meeting of the British Association at . . 47, 158 
Lychnis dioica , see Apocarpic Plant 
Meristematic Tissues and Protein Iso-electric Points—W. H. 
Pearsall and J. H. Priestley . . . . *185 
Microcystis in Ceylon, The Taxonomy and Variation of the 
Genus (1 Plate)—W. B. Crow . . . . -59 
New Zealand Flora, Hybridism in the, see Hybridism in the New 
Zealand Flora 
Penetration of Dissolved Substances into Plant Cells, The, see 
Permeability 
Permeability—Walter Stiles 
XI. The Determination of the Permeability of Plant 
Cells to Dissolved Substances . . 1 
XII. Quantitative Relations in the Penetration of Dis¬ 
solved Substances into Plant Cells . 72, 128 
XIII. Reversible and Irreversible Changes in Cell Per¬ 
meability ..... 204 
XIV. Theories of Cell Permeability (1 Text-fig.) 217, 239 
XV. Concluding Remarks .... 245 
Literature cited ..... 247 
Picea canadensis (Mill.) B.S.P., On the Phenomena attending 
Seasonal Changes in the Organisation in Leaf Cells of, see Seasonal 
Changes 
Plant Anatomy, Physiological Studies in, see Anatomy 
Plant Cells, The Penetration of Dissolved Substances into, see 
Permeability 
Plant Cells, The Permeability of, to Dissolved Substances, see 
Permeability 
Primula vulgaris var. caulescens —Miller Christy . . . 233 
Protein Iso-electric Points, see Meristematic Tissues 
