TABLE OF CONTENTS 
The development of Magnolia and Liriodendron, 
including a discussion of the primitiveness 
of the Magnoliaceae (with plates I-III) 
The maturation arse in Smilax herbacea Au 
plates IV-VI) - 
Comparative histology of alfalfa and clovers with 
eight figures) ~ - 
The réle of oxygen in germination., Contributions 
from the Hull Botanical Laboratory 181 - 
Studies on the reactions of Pilobolus to — 
stimuli (with twelve figures) - 
Morphology of Thismia americana. Contribu- 
tions from the Hull Botanical pare: 182 
(with plates VII-XI) -~ - 
Concerning the presence of diastase in certain red 
ga : = 
The male eumetophyte of Abies (with fifteen 
figures) - ~  * 
The anatomy of Osi ten: Contri- 
butions from the Hull Botanical ee 
183 (with sixteen figures) - 
Some effects of colloidal metals on S acetal vith 
four figures) - - 5 
The function of manganese in planta - - - 
The development of the prothallium of Camp- 
tosorus rhizophyllus (with plates XII and 
and eight text figures) - = - - 
The effect of shading on the transpiration and 
assimilation of the tobacco oo in Cuba 
(with one figure re) - ‘ 
A preliminary inquiry into the significance of 
tracheid-caliber in Coniferae 
Note on the ascosporic condition of the genus 
Aschersonia Montagne (with seven figures) - 
Morphological instability, especially in Pinus 
radiata (with plate XIV and two text figures) - 
bf 
Willis Edgar Maneval 
Marion G. Elkins 
Kate Barber Winton 
Charles A. Shull 
- Hally D, M. Jolivette 
Norma E. Pfeiffer 
E. T. Bartholomew 
A. H. Hutchinson 
Loren C. Petry 
W. D. Hoyt 
W. P. Kelley 
F. L. Pickett 
Heinrich Hasselbring 
Percy Groom 
Roland Thaxter 
Francis E. Lloyd 
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