Vol. XXII, No. 4 September 29, 1923 
THE 
NEW PHYTOLOGIST 
A BRITISH BOTANICAL JOURNAL 
EDITED BY 
A. G. TANSLEY, M.A., F.R.S, 
UNIVERSITY LECTURER IN BOTANY 
CAMBRIDGE 
i 
IN CONSULTATION WI 
LllSli 
F OF 
THE CAMBRIDGE BOTANY SCHOOL 
/ah O 
nr.T2 2'^° / 
£r u v * w 
V 
CONTENTS 
Variation as an Organic Function. By C. W. Soal, B.A. 
Meristematic Tissues and Protein Iso-electric Points. By W. H. Pearsall 
and J. H. Priestley. 
Content, Methods and Measurements in the Teaching of Elementary 
Botany. By Frederic E. Clements. 
Permeability ( continued ). By Walter Stiles. Chapter XIII. Reversible 
and Irreversible Changes in Cell Permeability. Chapter XIV. Theories 
of Cell Permeability. (With i figure in text). 
PAGE 
l6l 
I8 5 
191 
204 
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