CONTENTS. 
PAGE 
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.— Observations on the Action of X-rays on Plant Cells .. .. . 217 
RlCKETT, 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 inthe Text . . ... .299 
Szab6 , Z.—The Development of the Flower of the Dipsacaceae. With Plates VII and 
VIII and five Figures in the Text.. . *325 
Isaac Bayley Balfour, K.B.E., D.Sc., M.D., LL.D., F.R.S. . .. . . 335, 
NOTES. 
Smith, J. Henderson.— On the Apical Growth of Fungal Hyphae . 
Smith, Edith Philip. —Buffer Effects of Tap-water in the Estimation of Carbon 
Dioxide by Change in Hydrogen-ion Concentration. With one Figure in the Text 
Weston, William H., Jr.—The Water-mould Thraustotheca found in Formosa 
34 j 
344 
347 ■ 
m 
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