TABLE OF: CONTENTS 
Chromosomes in Osmunda. Contributions from the 
. Hull Botanical Laboratory 132 (with plate I) - Shigéo Yamanouchi 
The development of the embryo of ores open ine: 
(with plate II and one figure) - - W. T. Saxton 
The origin of heterospory in Marsilia. Goniiibutioas 
from the Hull Botanical es 133 ae 
plates ITI-VI and one figure) - - Charles H. Shattuck 
» On the lack of antagonism between cute versus 
magnesium and also between calcium versus 
sodium - - Charles B. Lipman 
The effect of certain eel 3 scat upon he trans- 
spiration and — of wheat re (with 
nine figures) - - Howard S. Reed 
Inheritance of sex in ee ‘(with two fees) — Harrison Shull 
The reforestation of sand plains in Vermont. Con- 
tributions from the Hull Botanical Laboratory : 
135 (with map and fifteen figures) - - Clijton Durant Howe 
On the origin of the broad oe: in gas = = 
Vill and IX) - Arthur J. Eames 
The prothallia of Kate and Seine: Conti: 
tions from the Hull Botanical mages: - 
(with plates X and XI) - - Edith Minot Twiss 
The structure and relationship of Urnula ee (with 
plate XII and three figures) - - VF. D. Heald and F. A. Wolf 
The exchange of material between saad and cyto 
plasm in Peperomia sintenisii (with plate XUN) - - William H. Brown 
Development of the Helvellineae Sides — XIV- 
XVI and one figure)- —-- - W.A. McCubbin 
On_ physiologically balanced ee for btiitin 
(B. subtilis) Charles B. Lipman 
The cell structure of Closteriua Rctienrh A C. 
moniliferum (with plates XVII and XVIII) - B. F. Lutman 
eo! and — in Colorado — seven 
W. W. Robbins 
The floral devel d ae Bist : 
_Sephanelore (with plates XIX anick XX) - -  R. Wilson Smith 
ing response in Dionaea (with one figure) 
William H. Brown and Lester W. Sharp © 
v 
PAGE 
