JANUARY, 1916 
No. 1 
AMERICAN 
JOURNAL OF BOTANY 
OFFICIAL PUBLICATION OF THE 
BOTANICAL SOCIETY OF AMERICA 
CONTENTS 
Physiological observations on alkaloids, latex and oxidases in Papaver 
somniferum Rodney H. True and W. W. Stock berger 1 
Notes on the anatomy of Peridermium galls Alban Stewart 12 
The climatic distribution of certain types of Angiosperm leaves 
Irving W. Bailey and Edmund W. SiNNOTT 23 
A Gymnosporangium virith repeating spores. , J. C. Arthur 39 
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 ofiSce at Lancaster, Pennsylvania, 
under the act of March 3. 1879. 
