vi CONTENTS 
The vessel in seed plants (with plates XVI-XX)_ - 
VOLUME LXxI 
Mary C. Bliss 
A convenient thermoregulator (with two figures) Heinrich Hasselbring 
Dormancy and hardiness in the plum. Contribu- 
tions from the Hull Botanical Ledesans 280 
(with four figures) - = 
Evolution of zoocecidia (with plates XXI, XXII) - 
The gametophytes of Eguisetum laevigatum (with 
plates XXIII, XXIV, and three figures) - - 
Comparison of development in dodder and morning 
glory (with plates XXV-XXVII) - 
Chemical changes in wheat during germination. 
Contributions from the Hull Botanical Labora- 
tory 281 (with plate XXVIII and two fig- 
ures Ce Mapes eer ge per a 
Undescribed willows of the section Cordatae (with 
one figure) - - - - - - - 
Vessels of the Gnetalean ga in spacinaiees see 
plates XXIX-XXXII) 
Embryogeny and Ssiromeielts in Reboulia hemi- 
sphaerica (with plate XXXIII and eleven fig- 
US) Le ee ee ee - 
Diameter growth in box elder and blue coupe me 
three figures) - 
BRIEFER ARTICLES— 
Biographical sketch of Wilhelm Pfeffer ts por- 
trait) - ~ 
Biographical sketch of John Macoun (with portrait) 
Biographical sketch of William Harris (with por- 
trait 
Simple device for weighing seeds (with one figure) - 
Use of chloroiodide of zinc in plant histology - = - 
spice sketch of Alfred Gabriel Nathorst vies 
rtrait)- = 
- P. D. Strausbaugh 
B. W. Wells 
Elda R. Walker 
Gertrude E. 
Macpherson 
Helen A. Choate 
Carleton R. Ball 
R. C. MacDuffie 
Arthur W. Haupt 
C. F. Korstian 
F. C. Newcombe 
Theo. Holm 
D. S. Johnson 
Karl Sax 
Ernst Artschwager 
A, C, Seward 
PAGE 
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438 
446 
454 
152 
236 
33t 
399 
400 
462 
