TABLE OF CONTENTS 
Measurement of the surface forces in soils. Contri- 
butions from the Hull Botanical Pati 
217 (with five figures) - - 
_A report on some allocthonous peat deposits of 
Florida. Part I: Topogrseni ve. dia- 
gram) - = Se ie 
On the mechanism of oxidase action Pe. four 
figures 
The temperature coefficient of the duration of life 
of Ceramium tenuissimum - - - 
Axial susceptibility gradients in algae - - - 
The vascular anatomy of Piper methysticum. 
Contributions from the Hull Botanical Lab- 
oratory 218 (with twenty-three figures) - - 
The structure of the bordered pits of conifers and 
its bearing upon the tension hypothesis of the 
ascent of sap in plants (with plate I and two 
es 
Charles A. Shull 
Carl C. Forsaith 
G. B. Reed 
Arthur H. Ayres 
~-C. M. Child 
Rachel E. Hoffstadt 
Irving W. Bailey 
Western plant studies. IV - Aven Nelson and J. Francis Macbride 
A physiological study of two strains of Fusarium 
in their causal relation to tuber rot and wilt 
of potato. Contributions from the Hull 
Botanical oo 219 —_ thirteen 
figures . - 
Aeriferous tissue in willow v galls vit oie 1 II-IV 
one K. K. Link 
and five figures) - - A. Cosens and T. A. Sinclair 
Chondromyces Thaxteri, a new —— — 
plates V and VI) 
The mode of action of plan rege vit two 
figures) - 
New dimorphic mutants of the Oenotheras vith 
five figures) : 
Ginkgo and the vii eretanatl a mechanisms of the 
seed plants (with plates VII-IX) E. C. Jeffrey and R. E. Torrey 
Vv 
J. H. Faull 
G. B. Reed 
Hugo DeVries 
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