THE 
BOTANICAL GAZETTE 
March ro1r 
Editor: JOHN M. COULTER 
CONTENTS 
The Causes of Vegetative Cycles Henry C. Cowles 
Studies on Jamaican Hymenophyllaceae Forrest Shreve 
A Wax Seal Method for Determining the Lower Limit of 
Available Soil Moisture —— J. Briggs and H. L. Shantz 
The Temperature Coefficient of the Duration of Life of 
Barley Grains T. Harper Goodspeed 
Briefer Articles 
Notes on Funaria hygrometrica Jennie M. Speer 
A Portable, Adjustable Camera Stand Harry B. Shaw 
Homothallic Conjugation in Rhizopus Florence A. McCormick 
Pistillody of Stamens in Hypericum nudifiorum Alfred Rehder 
Current Literature 
The University of Chicago Press 
CHICAGO, ILLINOIS 
CAMBRIDGE UNIVERSITY PRESS, London and Edinburgh 
aS WILLIAM WESLEY & SON, London 
oe TH, STAUFFER, Leipzig 
