vi CONTENTS [VOLUME XLVI 
Dioon spinulosum (with seven figures). Contribu- 
tions from the Hull Botanical Laboratory 131 Charles J. Chamberlain 4or 
of Amanita (with thirteen figures) - Stella G. Streeter 414 
The Williamsonias of the Mixteca site (with ten 
figures) - G. R. Wieland 427 
Sap LEP in the birch stem vith five ce). 
rt I H. E. Merwin and Howard Lyon 442 
a Lt oe - - - - - H. E. Merwin 447 
BRIEFER ARTICLES— 
Notes on the embryology of the N De acm’ 
(with plate VI) - . Mel.T. Cook 56 
Some hitherto eatin dbsct Sai ee ae oe 2 M. Greenman 146 
On the demonstration of the formation of starch 
in leaves - - Sophia Eckerson 224 
The morphology of Ruphio: maritima—a criticism Raymond H. Pond 228 
New normal appliances for use in ee See 
ology (with two figures) - W. F. Ganong 301 
Oxygen pressure and the germination of Sis 
thium seeds. Contributions from the Hull 
Botanical Laboratory 130 - Chas.-A. Shull 387 
Concavity of leaves and ftheitagion (vith one 
figure 
gu - Joseph Y. Bergen 459 
Roezl and Pe ae of | Washinglonia:- - - S. B. Parish 462 
Longevity of seeds - - Aljred J. ee and William Crocker 463 
CuRRENT LiTERATURE— OE Re + 2 OR, 4G) 250) 966. 408 gee 
For titles of book reviews see index under author’s 
name and reviews 
Papers noticed in “Notes for Students” are in- 
dexed under author’s name and subjects 
DATES OF PUBLICATION 
No. 1, July 21; No. 2, August 21; No. 3, September 18; No, 4, October 21; 
No. 5, November 15; No. 6, December 20 
