CONTENTS. 
No. CXLV, January 1923. PACE 
Ridley, H. N.—The Distribution of Plants .......... i 
Arber, Agnes.—O n the ‘ Squamulae Intravaginales ’ of the Helobieae. With five Figures in 
the Text .............. 3 1 
Snow, R.—The Conduction of Geotropic Excitation in Roots. With four Figures in the Text 43 
Waight, F. M. O.—On the Presentation Time and Latent Time for Reaction to Gravity in 
Fronds of Asplenium bulbiferum. With one Diagram in the Text .... 55 
Smith, Francis E. V.—On Direct Nuclear Divisions in the Vegetative Mycelium of Sapro- 
legnia. With twelve Figures in the Text . . . . . . . . . 63 
Adams, J.—The Effect on Certain Plants of altering the Daily Period of Light . . *75 
Haynes, Dorothy.—A Criticism of Beutner’s Theory of the Electromotive Force of Diphasic 
Liquid Systems and their Relation to Bio-electrical Phenomena 95 
Brown, William.—E xperiments on the Growth of Fungi on Culture Media. With seven 
Figures in the Text. . . . . . . . . . . . .105 
Grubb, Violet M.—The Attachments of Porphyra umbilicalis, (L.) J. Ag. With Plate I 
and eight Figures in the Text . . . . . . . . . . • I 3 I 
Crow, W. B.—Dimorphococcus Fritschii, a New Colonial Protophyte from Ceylon. With 
one Figure in the Text ............ 141 
NOTES. 
Cole, L. W.—Teratological Phenomena in the Inflorescences of Fagus sylvatica. With two 
Figures in the Text . . . . . . . . . . . . .147 
Grubb, V. M.—Preliminary Note on the Reproduction of Rhodymenia palmata, Ag. With 
two Figures in the Text . . . . . . . . . . . *151 
Tabor, R. J., and Bunting, R. H.—On a Disease of Cocoa and Coffee Fruits caused by 
a Fungus hitherto undescribed. With three Figures in the Text . . . .153 
No. CXLVI, April 1923. 
Samuels, J. A.—A Pathological Anatomical Study of Crystal Cyst Formation in Parenchy¬ 
matous Tissue in the Genus Anthurium. With Plate II and five Figures in the Text 159 
Thompson, W. P.—The Relationships of the Different Types of Angiospermic Vessels. With 
eleven Figures in the Text . . . . . . . . . . .183 
Willis, J. C.—Age and Area: A Reply to Criticism, with Further Evidence. With five 
Figures in the Text ........ ..... 193 
Williams, Maud.—O bservations on the Action of X-rays on Plant Cells . . . .217 
Rickett, H. W.—Fertilization in Sphaerocarpos, With Plates III and IV and three Figures 
in the Text .............. 225 
Pearsall, W. H.—Studies in Growth. IV. Correlations in Development. With six Figures 
in the Text ... ........... 261 
Matthews, J. R.— The Distribution of certain Portions of the British Flora. I. Plants 
restricted to England and Wales. With six Diagrams in the Text .... 277 
Robinson, Wilfrid, and Walkden, H.—A Critical Study of Crown Gall. With Plates V 
and VI and four Figures in the Text.299 
Szabo, Z.—The Development of the Flower of the Dipsacaceae. With Plates VII and VIII 
and five Figures in the Text . . . . . . . . . . .325 
Isaac Bayley Balfour . . .335 
