Vol. VIII. 
OCTOBER, 1921 
No. 8 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
CONTENTS 
The vascular anatomy of hemitrimerous seedlings of Phaseolus vulgaris. 
J. Arthur Harris, Edmund W. Sinnott, John Y, Pennypacker and 
G. B. Durham 375 
The effect upon permeability of polyvalent cations in combination with poly- 
valent anions Gran L. Raber 382 
The floral anatomy of the Urticales Albert Reiff Bechtel 386 
Genetic evidence of aberrant chromosome behavior in maize endosperm. 
R. A. Emerson 411 
PUBLISHED 
IN COOPERATION WITH THE BOTANICAL SOCIETY OF AMERICA 
BY THE 
BROOKLYN BOTANIC GARDEN 
At 41 North Queen Street, Lancaster, Pa. 
Eutored as«econd-clas« maUer February 21, 1914, at the post offictat Lancaster, Penntylrania, 
under the act of March 3, 1879 
