Vol. VI. 
JUNE, 1919 
No. 6 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF 1;HE 
BOTANICAL SOCIETY OF AMERICA 
» 
CONTENTS 
A study of plastids and mitochondria in Preissia and Corn . . W, C. Twiss 217 
The effect of the endrot fungus on cranberries. 
Neil E. Stevens and Fred Morse 235 
Endothia pigments. II. Endothine red . Chas. E. Sando 242 
Growth and variability in Helianthus . H. S. Reed 252 
PUBLISHED 
IN COOPERATION WITH THE BOTANICAL SOCIETY OF AMERICA 
BY THE 
BROOFXYN 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 
