25 April, 1922 
Vol. XXI, No. 2 
THE 
NEW PHYTOLOGIST 
A BRITISH BOTANICAL JOURNAL 
EDITED BY 
A. G. TANSLEY, M.A., F.R.S. 
UNIVERSITY LECTURER IN BOTAT^^' " ‘ ^ 
CAMBRIDGE 
IN CONSULTATION WITH T^E STAFF OF ; 
THE CAMBRIDGE BOTAN 4 scri&BL J ] [g29 . 
. / 
■ *^ 2*1 Muae^ ^ 
CONTENTS 
PAGE 
Permeability continued . By Walter Stiles. Chapter VII. The Cell Wall 49 
Physiological Studies in Plant Anatomy. I. Introduction. By J. H. 
Priestley . 58 
Physiological Studies in Plant Anatomy. II. The physiological relation 
of the surrounding tissue to the xylem and its contents. By J. H. 
Priestley and Dorothy Armstead .62 
A Critical Study of Certain Unicellular Cyanophyceae from the point of 
view of their Evolution. By W. B. Crow, M.Sc., F.L.S. ... 81 
Review. Lichens. By Annie Lorrain Smith, F.L.S.102 
A Method for Inducing Protoplasmic Streaming. By William Seifriz . 107 
WHELDON & WESLEY, Ltd. 
INCORPORATING 
WILLIAM WESLEY & SON 
28 ESSEX STREET, LONDON, W.C. 2 
Price Seven Shillings and Sixpence 
Subscription Price > Twenty-five Shillings per annum , post free 
