Vol. m. 
NOVEMBER, 1916 
No. 9 
AMERICAN 
JOURNAL OF BaSPANY 
DEC ^t>'/-' - 
OFFICIAL PUBLICATION OF THEyjk.^ 
BOTANICAL SOCIETY OF AMERK 
CONTENTS 
Specific action of barium. W. J. V. Osterhout 481 
Studies on exosmosis S. C. Brooks 483 
Effect of environmental conditions upon the number of leaves and the char- 
acter pf the inflorescence of tobacco plants . .H. A. Allard 493 
Oenothera mutants with diminutive chromosomes Anne M, Lutz 502 
PUBLJSHED 
IN COOPERATION WITH THE BOTANICAL SOCIETY OF AMERICA 
BY THE 
BROOKLYN BOTANIC GARDEN 
At 41 North Queen Street, Lancaster, Pa. 
Entered as second-class matter February 21, 1914, at the post office at Lancaster, Pennsylvania, 
under the act of March 3, 1879. 
