TABLE OF CONTENTS 
Physiological and morphological correlations in her- 
baceous Angiosperms Sac plates I-VII and 
four figures) - - i eae i 
After-ripening and germination of Juniperus seeds. 
Contributions from the Hull Botanical Labora- 
tory 275 (with one figure) - - 
Gametophyte and sex organs of Reboulia hemi- 
sphaerica. Contributions from the Hull Botani- 
cal Laboratory 276 (with twenty-one figures) - 
A chemical and physiological study of mottling of 
leaves. Contributions from the Hull Botanical 
Laboratory 277 (with six figures) - -  - 
Gametophytic reiceaiean mane of blister rusts — 
our figures) - - 
Development of head and flower of Dipsacus syl- 
vestris. Contributions from the Hull Botanical 
Laboratory 278 (with fourteen figures) - - 
Reserve food materials in vegetative tissues - - 
Leaf spots of the elm (with plates VIII—-X and one 
figure) - - i: i - a e 
Influence of environment on sexual expression in 
hemp (with plate XI and one figure) ~ . 
Experimental investigations on birch and oak See 
plates XII—XV and four figures) - 
Effect of light on germination of light-sensitive seeds. 
Contributions from the Hull Botanical Labora- 
E. C. Jeffrey 
and R. E. Torrey 
Dean A. Pack 
Arthur W. Haupt 
F. M. Scheriz 
J. F. Adams 
Hilary S. Jurica 
Gwynethe M. Tuttle 
L. E. Miles 
John H. Schaffner 
- Edith S. Whitaker 
tory 279 - - ~ - - Wright A. Gardner 
Ecology of Tilia americana. Il. Comparative 
studies of. the foliar ‘eee power chase 
ten figures) 
James E. Cribbs 
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