TABLE OF CONTENTS 
The origin and relationships of the Araucarians. I. 
L. Lancelot Burlingame 
The effects of illuminating gas on root systems. 
Contributions from the Hull Botanical Labora- 
tory 205 (with nine figures) 
Edward M. Harvey and R. Catlin Rose 
Notes on North American willows. II “— 
three figures) . Carleton R. Ball 
Oxidation in healthy and diseased a bark - Dean H. Rose 
Sanio’s laws for the variation in size of coniferous 
tracheids . - - Irving W. Bailey and H. B. Shepard 
The origin and ee of the Araucarians. 
II - L. Lancelot Burlingame 
Taxonomy and distribution of Eriodictyon aa 
three figures - - LeRoy Abrams and Frank J. Smiley 
Gametophyte of Pellia inne Contributions 
from the Hull Botanical Laboratory 2 
(with plates I-IV and one figure) - - - A. H. Hutchinson 
The Schumann rays as an agent for the sterilization 
of liquids (with one figure) - - W. T. Bovie 
Some filamentous — tested for Celiiilnes destroy 
ing power - - Freeman M., Scales 
Is the box elder a ae A pas of the com- 
parative anatomy of Negundo (with plates , 
V-X) - = = = =. = = + +. - Amon B. Plowman 
Some effects of ethylene on the metabolism of 
plants. Contributions from _ the u 
Botanical Laboratory 207 (with two figures) Edward Maris Harvey 
On the cuticles of some Indian conifers (with 
plate XI) - oes ee Ruth Holden 
‘The determination of additive effects ‘(ith four 
figures) - - - - - - - - W.J.V. Osterhout 
Rules and mechanism of inhibition and correlation 
in the regeneration of aac ieit ne 
(with forty-one figures) - - Jacques Loeb 
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