CONTENTS. 
PAGE 
Mottier, D. M.— The Embryology of some Anomalous Dicotyledons. 
With Plates XXVI and XXVII . . . . . 447 
Stevens, W. C. — Spore Formation in Botrychium virginianum. With 
Plates XXVI I I-XXX . . 465 
Tansley, A. G., and Lulham, Miss R. B. J. — A Study of the Vascular 
System of Matonia pectinata. With Plates XXXI-XXXIII 
and five Figures in the Text . . 475 
Andrews, F. M. — The Effect of Gases on Nuclear Division. With 
a Figure in the Text . 521 
Williams, J. Lloyd. — Studies in the Dictyotaceae. III. The 
Periodicity of the Sexual Cells in Dictyota dichotoma. With 
six Diagrams in the Text . . 531 
Stopes, Miss Marie C. — On the Double Nature of the Cycadean 
Integument 561 
NOTES. 
Blackman, V. H., and Fraser, Miss H. C. I.— Fertilization in 
Sphaerotheca 567 
Pertz, Miss D. F. M. — The Position of Maximum Geotropic Stimu- 
lation . . .569 
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