Vol. V. 
MARCH, 1918 
No. 3 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
CONTENTS 
A demonstration of photosynthesis. .............. .W. J. V. Osterhout 105 
The flavones of Rhus . . , Chas. E. Sando and H. H. Bartlett 112 
Conservatism and variability in the seedling of Dicotyledons. 
Edmund W. Sinnott 120 
Noteworthy Lejeuneae from Florida Alexander W. Evans 131 
- PUBLISHED 
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 Lancasti 
er, Pennsylvania, 
under the act of March 3, 1879. 
