INDEX OF AUTHORS 
PAGE 
Benson, Margaret. Note on a Numerical Sequence of Plant 
Families . . . . . . 90 
-The Grouping of Vascular Plants (1 Diagram) . .82 
Blackman, F. F. The Biochemistry of Carbohydrate Production 
in the Higher Plants from the point of view of Systematic 
Relationships ...... 2 
B(lackman), V. H. Practical Plant Biochemistry (Muriel Whel- 
dale Onslow) [Review] . . . . .43 
-The Theory of Geotropic Response . . 38, 246 
-Osmotic Pressure, Root Pressure and Exudation (3 Text- 
figs.) . 106 
Cutting, E. M. Heterothallism and Similar Phenomena . 10 
Darwin, Sir Francis. Studies in Phaenology. No. 2. 1920 . 30 
Dastur, R. H. and Saxton, W. T. A New Method of Vegetative 
Multiplication in Crotalaria burhia Ham. (1 Plate, 1 Text-fig.) 228 
Fritsch, F. E. Thalassiophyta and the Algal Ancestors of the 
Higher Plants . . . . . . 165 
Hodgetts, William J. A Study of Some of the Factors Con¬ 
trolling the Periodicity of Fresh Water Algae in Nature 
I-VI (3 Text-figs.) . . . . . 150 
VII-XVI (6 Text-figs.).195 
Lynn, M. J. The Reversal of Geotropic Response in the Stem. 
I. The Effects of Various Percentages of Carbon-dioxide 
(1 Plate) . . . . . . . 116 
Poulton, Ethel M. An Unusual Plant of Cheiranthus cheiri L. 
(16 Text-figs.) ...... 242 
Priestley, J. H. Suberin and Cutin . . . 17 
Rea, Margaret W. Stomata and Hydathodes in Campanula 
rotundifolia L., and their relation to Environment (6 Text- 
figs.) ....... 56 
Rich, Florence. A New Species of Coelastrum (15 Text-figs.) . 234 
