CONTENTS. 
PAGE 
Blackman, V. H. — Radio-activity and Normal Physiological Function .... 299 \ 
Carter, Nellie. — Studies on the Chloroplasts of Desmids. IV. With Plates XIV-XVI 303 
Holden, H. S. — Observations on the Anatomy of Teratological Seedlings. III. On the 
Anatomy of some Atypical Seedlings of Impatiens Roylei, Walp. With one hundred j 
and thirteen Figures in the Text . . . . 321 
Bottomley, W. B.— The Growth of Lemna Plants in Mineral Solutions and in their 
Natural Medium . . . . . . 345 
Bottomley, W. B. — The Effect of Organic Matter on the Growth of various Water Plants 
in Culture Solution. With Plate XVII . . . 353 ! 
McLean, F. T. — Field Studies of the Carbon Dioxide Absorption of Coco-nut Leaves. 
With Plate XVIII and nine Diagrams in the Text ... . . . . . 36 7 r 
Dastur, Jehangir Fardunji. — The Mode of Infection by Smut in Sugar-cane. With 
ten Figures in the Text . 391 
Pastur, Jehangir Fardunji.— Choanephora cucurbitarum, (B. and Rav.) Thaxter, on 
Chillies. With Plate XIX . . . . . ■ . 399 
Lewis, Francis J., and Tuttle, Gwynethe M.— Osmotic Properties of some Plant 
Cells at Low Temperatures. With five Figures in the Text . . . . 405 
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