Vol. VIII. 
JULY, 192 1 
No. 7 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
CONTENTS 
The relation of crop-plant botany to human welfare . , . Carlton R. Ball 323 
Correlations between anatomical characters in the seedling of Phaseolus vul- 
garis. 
J. Arthur Harris, Edmund W. Sinnott, John Y. Pennypacker 
and G. B. Durham 339 
A quantitative study of the effect of anions on the permeability of plant 
ceils— II - . Oran L. Raber 366 
The mechanism of root pressure and its relation to sap flow 
James Bertram Ove'rton 369 
PUBLISHED 
IN COOPERATION WITH THE BOTANICAL SOCIETY OF AMERICA 
BY THE 
BROOKLYN BOTANIC GARDEN 
At 41 North Queen Street, Lancaster, Pa. 
Eutared as second-cla»« matter February 21, 1914 at the post office at Lancaster, Pent\»ylyft«ia, 
under t act of March 3, 1879 . 
