Vol. III. No. 18 



November 4, 1913. 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

 Frederick Leslie Ransome Carl S. Scofibld Fred. Eugene Wright 



OBOLOOICAL aUBVKY BUREAU OF PLANT INDUSTRY OEOPHT8ICAI. LABORATOBT 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY. AUGUST AND SEPTEMBER, WHEN MONTHLY, 



BY THE 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 

 THE WAVERLY press , 

 BALTIMORE, MD. 



