TABLE OF CONTENTS, VOLUME IX, 1922 
No. I, January 
Page 
Ecological relations of plants in southeastern Missouri (with three text 
figures and Plates I and II) J. C. Th. Uphof i 
Methods of healing in some algal cells (with Plate III) 
Susan P. Nichols 18 
The pres nt status of Scolopendrium in New York State (with two 
text figures) Mabel R. Hunter 28 
Biophysics as a point of view in plant physiology 
Howard E. Pulling 37 
No. 2, February 
The growth of field corn as affected by iron and aluminum salts (with 
six text figures and Plate IV) Charles Homer Arndt 47 
Control of the sexual state in Arisaema triphyllum and Arisaema 
Dracontium John H. Schaffner 72 
A demonstration of numerous distinct strains within the nominal species 
Pestalozzia Guepini Desm. . . Carl D. La Rue and H. H. Bartlett 79 
No. 3, March 
UndercooHng of peach buds (with one text figure) . . Earl S. Johnston 93 
Significance of the behavior of sensitive stigmas F. C. Newcombe 99 
The relation of age to size in certain root cells and in vein-islets of the 
leaves of Salix nigra Marsh, (with three text figures) 
Marjorie a. Tellefsen 121 
The origin of new varieties of Nephrolepis by orthogenetic saltation II. 
Regressive variation or reversion from the primary and secondary 
sports of bostoniensis (with Plates V-X) R. C. Benedict 140 
No. 4, April 
Hydrogen-ion concentration in its relation to wheat scab (with 18 
text figures) E. F. Hopkins 159 
On the physiological balance in nutrient solutions for plant cultures 
W. F. Gericke 180 
Vegetative vigor of the host as a factor influencing susceptibility and 
resistance to certain rust diseases of the higher plants I. 
M. A. Raines 183 
Rots of early strawberries in Florida and southern California (with 
four text figures) Neil E. Stevens 204 
