Vol. VI. 
OCTOBER, 1919 
No. 8 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
CONTENTS 
Venation and senescence of polyembryonic Citrus plants . . . M, R. Ensign 311 
A study of some factors in the chemical stimulation of the growth of Asper- 
gillus niger . Robert Aaron Steinberg 330 
PUBLISHED 
IN COOPERATION WITH THE BOTANICAL SOCIETTY OF AMERICA 
BY THE 
BROOKLYN BOTANIC GARDEN 
At 41 North Queen Street, Lancaster, Pa. 
Entered as second-clasi matter February 21, 1914, at the post ofRce at Lancaster, Pennsylvania, 
under the act of March 3, 1879 
