Vi CONTENTS 
Absorption of sodium and calcium by wheat urna 
For titles of book i ind Z thor’s 
name and reviews 
Papers noticed in “Notes for Students” are in- 
_ dexed under author’s name and subjects 
[VOLUME LXVI 
PAGE 
(with one figure) -  - - Howard S. Reed 374 
Morphology of Rumex crispus. Contributions from 
the Hull Botanical Laboratory 244 Sela Jeet 
XVII-XIX and twenty-one figures) Winfield Dudgeon 393 
Notes on North American trees. III. Tilia. I. - C. S. Sargent 421 
‘Pine needles, their significance and — hes 
twenty-nine figures) - - - Jean Dufrenoy 439 
Limiting factors in relation to specific ranges of toler- 
ance of forest trees (with seven figures) - - A.H. Hutchinson 465 
Notes on North American trees. III. Tilia. II - C. S. Sargent 494 
The purple hyacinth bean (with seven figures) - - George F. Freeman 512 
A morphological study of Pallavicinia Lyellii. Con- 
tributions from the Hull Botanical Laboratory 
245 (with plates XX-XXIV) - - - - - ArthurW. Haupt 524 
BRIEFER ARTICLES— 
Meaptee en cones of Pinus montana Astaro one 
figure) - W.N. Steil 68 
Healthy and sick specimens of Bryophyllum calycinum Jacques Loeb 69 
Modified safety-razor blade holder for Se aane: 
control (with one figure) T. H. Goodspeed 176 
Pollination of Asclepias cryptoceras- - - -  ~- Charles Robertson 177 
Cross-conjugation in Spirogyra Weberit (with one 
figure) - - - - - = - = = = Bert Cunningham 272 
An endemic begonia of Hawaii =, = - i= = V. MacCaughey 273 
Secondary parasitism in Phoradendron - -  - J. Arthur Harris 275 
Method of replacing paraffin solvent with paraffin - T.H. Goodspeed 381 
Adaptation and natural selection - - -  E.F. Andrews 382 
Joseph Young Bergen (with portrait) - - - - RodneyH.True 455 
Modification of hand microtome (with five figures) - 7. H.Goodspeed 534 
CurRENT LITERATURE - - - - - = 70,178,277,383, 459,537 
