TABLE OF CONTENTS 
Ratio of phosphate, nitrate, and potassium on 
absorption and growth (with nine figures) 
Oswald Schreiner and J. J. Skinner 
Contributions to the life history of Widdringtonia 
_ ae _— I-III and three 
fi 
gure ' W.T. Saxton 
Some pecediat ber pirothalia. Contributions ota 
the Hull Botanical eset st BL (with 
eleven figures) - Lula Pace 
Periodicity in Dictyota at Nati (with one hicue) I. F. Lewis 
The morphology of the Podocarpineae.. Con- 
tributions from the Hull Botanical Labora- 
tory 138 (with plates IV-VI) . Mary S. Young 
The origin of ray tracheids in the bends: (with 
sixteen figures) - W. P. Thompson 
On the relationship fctween "the joe of the pod « 
and fertility and Ss erm in Cercis ay one 
figure) - - . J. Arthur Harris 
Development of the are sidtion “agi young 
ovule of Zamia me oes oo 
gures - Frances Grace Smith 
Saeed enzymes a their tics to ae 
stain” in lumber - - rs - Irving W. Bailey 
Some effects of a harmful organic aa constituen 
(with eleven figures)  - Oswald S eaeie and J. J. Skinner 
Some observations on aie Contributions 
from the Hull Botanical eotomadl 139 
(with one figure) - Chas. O. Appleman 
Twin hybrids (laeta — veletinc) ar their 
anatomical distinctions - - - Frank M. Andrews 
An eocene flora in Georgia and the inditaaied 
physical conditions (with two figures) - Edward W. Berry 
Notes on the sex of the — of Onoclite® 
Struthiopteris- —- - David M. Mottier 
Relation of soil moisture to dept venetating 
(with four figures) - - = = Burton Edward Livingston 
The effect of longitudinal compression upon the 
production of mechanical tissue in stems 
— two figures) - —- -  L.H. Pennington — 
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