Vol. VIII MARCH, 1921 No. 3 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
192 
CONTENTS 
A study of Rhus diversiloba with special reference to its toxicity 
James B. McNair 127 
The effect of salt proportioiLS and concentrations on the growth of Aspergillus 
niger . . . . . . . . ... . . , . . ... . . . . C M, Haenseler 147 
Suggestions with respect to the measurement of osmotic pressure 
L. KnUDSON AND S. GiNSBURG 164 
Thick-walled root hairs of Gleditsia and related geiiera 
W. B. McDouGALL 171 
A simple method for growing plants . . J. M. Brannon 176 
PUBLISHED 
IN COOPERATION WITH THE BOTANICAL SOCIETY OF AMERICA 
At 41 North Queen Street, Lancaster, Pa. 
BY THE 
BROOKLYN BOTANIC GARDEN 
Brooklyn, N. Y, 
Entered M sccond-claa* matter February 31. 1914, at the post office at Lancaster^ Penniylvaaia, 
under the act of March 3, 1S79 
